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 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;
   }
}

I have controls inside a RadCollapsiblePanel that I want to layout left to right and wrap to the next row.

I added a FlowLayoutPanel inside the RadCollapsiblePanel and added my controls in the FlowLayoutPanel.

However, the RadCollapsiblePanel doesn't display the scrollbars this way. It looks like the RadCollapsiblePanel isn't aware when the FlowLayoutPanel has overflown.

Hello, I need to use RadListView to display records in ListDetails in WINFORMS. I have an active field that returns true or false. I want to display it with a checkbox to make the display more presentable. Is this possible? I look forward to your responses. Thank you.

Good morning,

Is there a way to enable natural sorting (two-way sorting) also in Winforms Virtualgrid? I saw that it is possible in ASP.NET AJAX libray (https://www.telerik.com/products/aspnet-ajax/documentation/controls/grid/functionality/sorting/controlling-sort-modes)

Thank you very much.

Emanuele

Hi sir 

      I install the version "2017_2_613_40" but in toolbox tab control not present how we enable that tab control

WinForms TreeView displays icons and text. How to obtain the Rectangle of the icon area, or how to implement the click event of the icon. Through the method in https://www.telerik.com/forums/hovering-over-node-image: 
TreeNodeImageElement imageElement = radTreeView1.ElementTree.GetElementAtPoint(e.Location) as TreeNodeImageElement;
The obtained structure is null, and the version is 2025.

thaks

 When the RadCheckBox or RadToggleButton control is clicked quickly, an exception will be thrown: System.NullReferenceException: "Object reference not set to an instance of an object."

Hi there,


I have written a component that resides within a column of a RadGridView. Based on the provided source code, I need the cell events like CellBeginEdit, CellEndEdit, and CellValueChanged in the RadGridView to be handled intelligently and reliably for columns of the AdvancedRadMultiColumnComboPlus type.

In other words, how can I get events like CellBeginEdit, CellEndEdit, and CellValueChanged to fire for columns of the AdvancedRadMultiColumnComboPlus type?

Please guide me.

Thank you.