Questions on UI for WinForms Forum

1 answer

371 views

[Solved] TreeView will not update after DataSource has been set to null

When using an object-relational binding with the TreeView control, if the DataSource is set to something, set to null and then set to something again the tree will no longer update.

Here is a code sample:

1. Click Load - the base data appears in the tree.
2. Click Add - a new node appear in the tree.
3. Click Clear - all nodes are erased.
4. Click Load - base data is added back in and appears
5. Click Add - nothing happens...

public partial class Form1 : Form

{

BindingList<Thing> RootChildren;

int currentId = 1;

public Form1()

{

InitializeComponent();

}

private void buttonLoad_Click(object sender, EventArgs e)

{

radTreeView1.DataSource = null;

RootChildren = new BindingList<Thing>();

Thing t1 = new Thing(1, "One");

Thing t2 = new Thing(2, "Two");

Thing t3 = new Thing(3, "Three");

Thing t4 = new Thing(4, "Four");

currentId = 5;

RootChildren.Add(t1);

RootChildren.Add(t2);

RootChildren.Add(t3);

RootChildren.Add(t4);

radTreeView1.DataSource = RootChildren;

radTreeView1.ChildMember = @"Children\Children\Children\Children";

radTreeView1.ValueMember = "Id";

radTreeView1.DisplayMember = "Name";

}

private void buttonClear_Click(object sender, EventArgs e)

{

radTreeView1.DataSource = null;

}

private void buttonAdd_Click(object sender, EventArgs e)

{

Thing thing = new Thing(currentId, "NewThing" + currentId);

RootChildren.Add(thing);

currentId++;

RootChildren.ResetBindings();

}

public class Thing

{

public int Id { get; set; }

public string Name { get; set; }

public BindingList<Thing> Children = new BindingList<Thing>();

public Thing() { }

public Thing(int id, string name)

{

Id = id;

Name = name;

}

Treeview

answered on 18 Apr 2013

1 answer

236 views

[Solved] How to customise radDocument

Hi,
I had created rad blank document
this.NotePadTextBox.Document = new RadDocument();
Now i want to set properties like

Height & Width
LineSpacing
LineSpacingType
- AtLeast - the space between the lines should equal or greater than the value of the LineSpacing property.
- Auto - the space between the lines is determined automatically.
- Exact - the space between the lines should equal to the value of the LineSpacing property.
PageViewMargin -
ParagraphDefaultSpacingAfter
ParagraphDefaultSpacingBefore
SectionDefaultPageMargin -
Font

I know two of them this.NotePadTextBox.Document.LayoutMode = DocumentLayoutMode.Paged;
this.NotePadTextBox.Document.SectionDefaultPageMargin = new System.Windows.Forms.Padding(100);
But i don't know how to set rest of them,it is not specified in help file.
Also i want to set default font for newly created document

RichTextBox (obsolete as of Q3 2014 SP1)

answered on 18 Apr 2013

1 answer

118 views

[Solved] Treeview does not show drag indicator lines with Visual Studio 2012 Light Theme

Treeview will not show the drag indicator dotted lines when using the Visual Studio 2012 Light theme. This makes it hard to tell exactly where a TreeNode will be dropped.

Treeview

answered on 18 Apr 2013

2 answers

203 views

[Solved] Setting ShowUpDown in RadDateTimePicker disables control.

Hi,

Format: Custom,
CustomFormat: HH:mm
ShowUpDown: True

In version 2013.1.321.40 when when I set these settings control becomes disabled in designer.

Calendar, DateTimePicker, TimePicker and Clock

answered on 18 Apr 2013

1 answer

303 views

GridViewComboBoxColumn - DropDownArrow click event

Hello guys,

in my GridView i have a ComboBoxColumn. Is it possible to fire an event when someone clicks on the DropDownArrow ? In addititon the DropDownList should not open because i want to open a new form to select values.

thanks in advance

Markus

GridView

answered on 18 Apr 2013

0 answers

173 views

how to select all text in rad textbox with multiline propery

Hi guys,
i am using textbox with multiline propery and i set accept return property to true. if i press cntrl + a all text in textbox is not selected. please give solution for this.

TextBox

asked on 17 Apr 2013

3 answers

198 views

[Solved] Bug With Windows 8 Theme

I think I have found a bug with the Windows8 theme. I put a RadDropDownList on my form and set the size to 400,20. When I run the form the size looks to be reduced to about half the width.

As a further test, I docked the DropDown to the bottom of a groupBox and you can now see that the border is being resized, you can see the control background itself is fully docked. Note the Default theme draws the border correctly.

It also seems to truncate longer entries.

Themes and Visual Style Builder

answered on 17 Apr 2013

1 answer

101 views

Cant increase the high of a form

Hi, Im working in visuals Studio 2010.
programming in C#

There is a form that i need it to be with a high of 2000 but it doesn't let me make it bigger than 832
the Maximum size property is set to 0
and Autosize = false

In other computer it let me make it of the high i want, but then when I come back to my computer and open it in designer it make the form shorter and cant see the buttons in it.

why?
how to fix it?

thanks
iair

PS: telerik version: 2013.1.220.40

Form

answered on 17 Apr 2013

1 answer

182 views

CaseSensitive for RadMultiColumnCombobox

Hi
I used from multicolumncombobox with custom filtering.I don't want to be different 'A' and 'a'.
I used this code but not fix this problem.
MultiCol.editorcontrol.casesensitive=false;
Or
MultiCol.editorcontrol .mastertemplate.casesensitive=false;
how can i fix this problem?
Thank you

MultiColumn ComboBox

answered on 17 Apr 2013

1 answer

159 views

Exception Report

Hi,

i'm currently evaluating the Rich Textbox Control and i found some minor bug in it. If you add a hyper link at the beginning of the document and then try to delete it in the editor, an exception is thrown.

This is how I add the hyper link:
HyperlinkInfo lHyperlinkInfo = new HyperlinkInfo();
lHyperlinkInfo.NavigateUri = "mailto://test@test.de";
radRichTextBox1.InsertHyperlink(lHyperlinkInfo, "Test");

After deleting the hyper link in the editor, the following exception appears:
System.NullReferenceException: FromElement must not be null.
bei Telerik.WinControls.RichTextBox.Model.DocumentElement.CopyPropertiesFrom(DocumentElement fromElement)
bei Telerik.WinControls.RichTextBox.DocumentView.GetCurrentParagraphStyle()
bei Telerik.WinControls.RichTextBox.DocumentView.UpdateCurrentStyles()
bei Telerik.WinControls.RichTextBox.DocumentView.document_DocumentArranged(Object sender, EventArgs e)
bei Telerik.WinControls.RichTextBox.Model.RadDocument.OnDocumentArranged()
bei Telerik.WinControls.RichTextBox.Layout.DocumentLayoutBox.ArrangeOverride(SizeF finalSize)
bei Telerik.WinControls.RichTextBox.Layout.LayoutElement.ArrangeCore(RectangleF finalRect)
bei Telerik.WinControls.RichTextBox.Layout.LayoutElement.Arrange(RectangleF finalRect)
bei Telerik.WinControls.RichTextBox.Layout.ContextLayoutManager.UpdateLayout()
bei Telerik.WinControls.RichTextBox.DocumentPosition.CallOnPositionChanging()
bei Telerik.WinControls.RichTextBox.DocumentPosition.MoveToPreviousInline()
bei Telerik.WinControls.RichTextBox.DocumentPosition.GetPreviousInlineBox()
bei Telerik.WinControls.RichTextBox.Model.RadDocument.IsValidPosition(DocumentPosition p)
bei Telerik.WinControls.RichTextBox.Model.RadDocument.EnsureValidPositionCallback(DocumentPosition p, Func`1 IsMoveForward)
bei Telerik.WinControls.RichTextBox.DocumentPosition.ResumePositionValidation()
bei Telerik.WinControls.RichTextBox.Model.RadDocument.ExecuteCommand(CommandBase command, DocumentCommandContext context)
bei Telerik.WinControls.RichTextBox.DocumentView.Delete(Boolean deletePrevious)
bei Telerik.WinControls.RichTextBox.UI.InputBehavior.ProcessBackKey(KeyEventArgs e)
bei Telerik.WinControls.RichTextBox.UI.InputBehavior.ProcessKeyDown(KeyEventArgs e)
bei Telerik.WinControls.RichTextBox.RadRichTextBox.OnKeyDown(KeyEventArgs e)
bei System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
bei System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
bei System.Windows.Forms.Control.WmKeyChar(Message& m)
bei System.Windows.Forms.Control.WndProc(Message& m)
bei System.Windows.Forms.ScrollableControl.WndProc(Message& m)
bei Telerik.WinControls.RadControl.WndProc(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
bei System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
bei System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Best regards
Martin

RichTextBox (obsolete as of Q3 2014 SP1)

answered on 17 Apr 2013