message error: La référence d objet n'est pas définie à une instance d'un objet.

Hello,
In my Frame, I use a RadDock with documentContainer and two toolwindows.
I would like the toolWindowFamily to dock automatically when I select it, rather than having to press the “pin” image.

On the “stabstripItem_click”, I put: oToolwindow:DockState=  Telerik.WinControls.UI.Docking.DockState:Docked.

Here is my code:

METHOD PRIVATE VOID TabStripItem_Click( INPUT sender AS System.Object, INPUT e AS System.EventArgs ):

        DEFINE VARIABLE oTabStripItem AS Telerik.WinControls.UI.TabStripItem       NO-UNDO.
        DEFINE VARIABLE oToolwindow   AS Telerik.WinControls.UI.Docking.ToolWindow NO-UNDO.
        DEFINE VARIABLE cValeur       AS CHARACTER                                 NO-UNDO.        

        oTabStripItem = CAST(sender, Telerik.WinControls.UI.TabStripItem) NO-ERROR.
        IF oTabStripItem NE ? THEN 
        DO:
            oToolwindow = CAST(oTabStripItem:TabPanel, Telerik.WinControls.UI.Docking.ToolWindow) NO-ERROR.

            IF VALID-OBJECT(oToolwindow) THEN DO:

                IF oToolwindow NE ? THEN 
                DO:

                    IF THIS-OBJECT:DockPrincipal:ActiveWindow NE oToolwindow THEN 
                    DO:                     
                        oActiveWindow = THIS-OBJECT:DockPrincipal:ActiveWindow.
                        cValeur = THIS-OBJECT:oongFamilleListe:GetToolwindowFurtifValeur( oToolwindow:NAME ).

                        InitialiseToolWindow( oToolwindow:NAME ).
                        CASE oToolwindow:Name:                        
                            WHEN gcToolWindowNomAide[1] THEN DO:
                                IF cValeur NE "?" AND cValeur NE 'OFF'
                                    THEN THIS-OBJECT:oongCodeAnalytiqueAide:Initialisation(cValeur).                                
                                    ELSE THIS-OBJECT:oongCodeAnalytiqueAide:Initialisation("").

                                oToolwindow:Enabled = ( cValeur NE "?" AND cValeur NE 'OFF').        
                            END.
                            WHEN gcToolWindowNomFiltre[1] THEN DO:   

                               glDockParCode= YES.            
                               oToolwindow:DockState=  Telerik.WinControls.UI.Docking.DockState:Docked.
                               glDockParCode= NO.

                                oToolwindow:Enabled = YES.      
                                gcNoeudCourant = 'C000'.
                                glFiltreVisibleFamille = YES.  
                                oongFamilleArborescence:SelectionNoeud(gcNoeudCourant).

                                IF glRafraichir THEN DO:
                                    SetEtatObjet("BtnSupprimer", NO).                                    
                                    //SetEtatObjet("BtnCopier", NO).
                                    //SetEtatObjet("BtnColler", NO).
                                    //SetEtatObjet("BtnCollerInserer", NO).
                                    oongFamilleListe:SetParamFiltreFamille ( glFiltreVisibleFamille ,gcNoeudCourant ).  
                                    oongFamilleListe:Rafraichir( ).

                                END.

                            END.                                               
                        END CASE.

                        THIS-OBJECT:DockPrincipal:ActiveWindow = oToolwindow.

                    END.
                    ELSE 
                    DO:
                        THIS-OBJECT:DockPrincipal:CloseAutoHidePopup().
                        oToolwindow:AutoHideTab:Click:UnSubscribe(THIS-OBJECT:TabStripItem_Click) NO-ERROR.
                        oToolwindow:AutoHideTab:Click:Subscribe(THIS-OBJECT:TabStripItem_Click) NO-ERROR.
                        IF THIS-OBJECT:DockPrincipal:ActiveWindow NE oActiveWindow THEN
                            THIS-OBJECT:DockPrincipal:ActiveWindow = oActiveWindow.
                    END.
                END.
            END.
            ELSE DO:
                MESSAGE 'ERR - TabStripItem_Click '
                VIEW-AS ALERT-BOX.
                RETURN.
            END. 
        END.             
      /*                   
      IF lFlgDocked THEN DO:                      
          //oToolwindow:AutoHideTab:Click:UnSubscribe(THIS-OBJECT:TabStripItem_Click) NO-ERROR.
                           glDockParCode = YES.
                           oToolwindow:DockState=  Telerik.WinControls.UI.Docking.DockState:Docked NO-ERROR.  
                           oToolwindow:Tag = "ON".
                           glDockParCode = NO.
                       //    oToolwindow:AutoHideTab:Click:Subscribe(THIS-OBJECT:TabStripItem_Click) NO-ERROR.
      END.  
      */              
        RETURN.
    END METHOD.

Hi;

I have a problem that I don't know how to solve.

I have a grid with several columns and rows containing different data types (text, numbers, images, etc.). Some of the cells are formatted using the RowFormatting event.

The grid also allows filtering by column.

I noticed that when my grid has many rows and is filtered, scrolling becomes very slow. If it's not filtered, it works perfectly with the same number of rows.

After investigating further, I realized that the FilterChanged event is being triggered multiple times when scrolling.

Furthermore, the value of MasterView.Rows.Count is different each time the event is executed. Sometimes it shows the filtered count, and other times it shows the unfiltered count.

This, in addition to the slowness, is a serious problem. For example, if I have a thread running that performs an action on filtered rows, I encounter issues with indexing and incorrect row selection.

I've attached a sample project. If you filter by a column and then scroll, the number of rows in the MasterView will be displayed in the text box.

Could you help me to solve this problem?

Thank you so much.

Regards

Hi,

What is the best approach to adding a simple button to some cells (not all) in a grid view text box column? My column is read only and contains html text. I should also add that the button should overlay any text that might appear underneath it... So cell cannot contain stacked or docked sub elements.

I simply want to be able to show and handle a button at the top right hand corner of the cell. This cell is only added based on a some other algorithm in my code.

I thought aboutusing ButtonRenderer in a CellPaint but the text and button outline appear in 2 different places, so it seems that ButtonRenderer does not consider e.Graphics suplied to cell paint!

Any ideas?
Cheers
Toby

I want to use RadLabel _lblPreview as an information display control. When the text display width is less than the width of the Panel, I hope the content is displayed in the middle of the Panel.
_lblPreview.Height = 100;
_lblPreview.Font = new Font(fontName, size, FontStyle.Regular);
lblPreview.TextAlignment = ContentAlignment.MiddleCenter;
_lblPreview.Text = "样本文本 abc123.,";
_lblPreview.Dock = DockStyle.Top;
_lblPreview.AutoSize = true,
When gradually increasing the font size, the display is correct. However, when AutoSize is set to false, after the font size reaches 46, the displayed content gets truncated, and when it reaches 52, there is no display at all. What is the reason?

Using the current AI coding assistant, the responses consistently hallucinate methods.

I found this to be a problem when using regular ChatGPT v4, but this went away when i moved to v5.

If you are not using it already, I suggest moving your AI model to V5. I realize it is more expensive, but it at least useful!

I am using the Telerik Reporting REST Service project to render code-based reports in the WinForms ReportViewer. But I have a problem with this "PREVIEW" button, when the user quickly clicks multiple times while generating the Report. It throws the following exception within the viewer: 

I just want to disable the Preview button while the report is still generating, and enable it once the report is fully generated. And I don't want to allow the user to double-click the PREVIEW button(Disable the button immediately on a first click until the report is fully generated).

Please help me fix my issue.

Thanks in advance.

I want to keep the BindingNavigator centered, so I placed it inside a TableLayoutPanel without any docking or anchor, the column is set to auto size.

When the items in the BindingNavigator grow, mainly when the CommandBarLabel's value gets updated, the last button gets hidden from the screen.

How can I make the navigator itself to grow and shrink with its items?

I am on 2022 R3.

I want to control a collapsible panel programmatically.  Also, I want the button section at the top hidden.  So far, I have that part working.  I also have the expanding/collasping working as well, but I have run into a problem. When I collapse the panel, the panel does not collapse all the way, it still sticks out a little bit, by like 12-14 pixels (in this case, on the bottom).  This is a problem for me, as I am expecting that entire space to be gone.

This is the Collasible Panel, where I have hidded the Header Panel and IsExanded is set to false:

This is the designer.cs part.  I am not sure what I am missing. What else to I need to do to make the panel have a height of 0.

namespace TEST
{
   partial class RadForm1
   {
      /// <summary>
      /// Required designer variable.
      /// </summary>
      private System.ComponentModel.IContainer components = null;
 
      /// <summary>
      /// Clean up any resources being used.
      /// </summary>
      /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
      protected override void Dispose(bool disposing)
      {
         if (disposing && (components != null))
         {
            components.Dispose();
         }
         base.Dispose(disposing);
      }
 
      #region Windows Form Designer generated code
 
      /// <summary>
      /// Required method for Designer support - do not modify
      /// the contents of this method with the code editor.
      /// </summary>
      private void InitializeComponent()
      {
         this.radCollapsiblePanel1 = new Telerik.WinControls.UI.RadCollapsiblePanel();
         ((System.ComponentModel.ISupportInitialize)(this.radCollapsiblePanel1)).BeginInit();
         this.radCollapsiblePanel1.SuspendLayout();
         ((System.ComponentModel.ISupportInitialize)(this)).BeginInit();
         this.SuspendLayout();
         // 
         // radCollapsiblePanel1
         // 
         this.radCollapsiblePanel1.IsExpanded = false;
         this.radCollapsiblePanel1.Location = new System.Drawing.Point(84, 96);
         this.radCollapsiblePanel1.Name = "radCollapsiblePanel1";
         this.radCollapsiblePanel1.OwnerBoundsCache = new System.Drawing.Rectangle(84, 96, 393, 200);
         // 
         // radCollapsiblePanel1.PanelContainer
         // 
         this.radCollapsiblePanel1.PanelContainer.Size = new System.Drawing.Size(0, 0);
         this.radCollapsiblePanel1.Size = new System.Drawing.Size(393, 21);
         this.radCollapsiblePanel1.TabIndex = 1;
         ((Telerik.WinControls.UI.RadCollapsiblePanelElement)(this.radCollapsiblePanel1.GetChildAt(0))).IsExpanded = false;
         ((Telerik.WinControls.UI.CollapsiblePanelHeaderElement)(this.radCollapsiblePanel1.GetChildAt(0).GetChildAt(1))).Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
         // 
         // RadForm1
         // 
         this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
         this.ClientSize = new System.Drawing.Size(511, 254);
         this.Controls.Add(this.radCollapsiblePanel1);
         this.Name = "RadForm1";
         this.Text = " ";
         ((System.ComponentModel.ISupportInitialize)(this.radCollapsiblePanel1)).EndInit();
         this.radCollapsiblePanel1.ResumeLayout(false);
         ((System.ComponentModel.ISupportInitialize)(this)).EndInit();
         this.ResumeLayout(false);
 
      }
 
      #endregion
 
      private Telerik.WinControls.UI.RadCollapsiblePanel radCollapsiblePanel1;
   }
}