Hi

I am adding items to listbox like this (from a background worker thread).

  dim d as New AddDelegate(AddressOf radListBox1.Items.Add)
  dim item as New RadListBoxItem
  item.Text = "some text"
  dim args() as Object = {item}
  radListBox1.Invoke(d, args)

However I sometimes get an error after some items are added (I think it
is also if an item is selected in the listbox and if I change hide and show the form). This is thrown on the main form. If tried using the BeginUpdate and EndUpdate method as well, but that doesn't seem to make a difference.

This is the message
    "Parameter is not valid."

Here is the stack trace

   at System.Drawing.Graphics.CheckErrorStatus(Int32 status)
   at System.Drawing.Graphics.DrawImage(Image image, Int32 x, Int32 y, Int32 width, Int32 height)
   at System.Drawing.Graphics.DrawImage(Image image, Rectangle rect)
   at Telerik.WinControls.Paint.RadGdiGraphics.DrawBitmap(Image image, Int32 x, Int32 y, Double opacity)
   at Telerik.WinControls.Paint.RadGdiGraphics.DrawBitmap(Image image, Int32 x, Int32 y)
   at Telerik.WinControls.Primitives.FillElementPaintBuffer.ResetGraphics(IGraphics g, SizeF scale)
   at Telerik.WinControls.Primitives.FillPrimitive.PaintPrimitive(IGraphics g, Single angle, SizeF scale)
   at Telerik.WinControls.Primitives.BasePrimitive.PaintElement(IGraphics graphics, Single angle, SizeF scale)
   at Telerik.WinControls.RadElement.PaintElement(Graphics rawGraphics, IGraphics graphics, Single angle, SizeF scale, Region currentClip)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintOverride(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadItem.PaintOverride(IGraphics screenRadGraphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.VisualElement.PaintChildren(IGraphics graphics, Rectangle clipRectange, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RadElement.Paint(IGraphics graphics, Rectangle clipRectangle, Single angle, SizeF scale, Boolean useRelativeTransformation)
   at Telerik.WinControls.RootRadElement.Paint(IGraphics graphics, Rectangle clipRectangle)
   at Telerik.WinControls.RadControl.OnPaint(PaintEventArgs e)
   at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs)
   at System.Windows.Forms.Control.WmPaint(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at Telerik.WinControls.RadControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Dcsa.WpAdmin2.UI.Startup.Main() in C:\_SourceCode\DCX (SA) Workplace\Workplace.Windows\Workplace.Admin.UI\Startup.vb:line 7
   at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Hi Telerik

Can you give us a example how to implement the scroll bar to the telerik and Micorsoft Control? We can't find it User manual.

And  when we try to use the telerik control, we found "flicker" is a big problem at many place. Do you have anu good solution to make the change between the different control more smooth?

Thank you

hi,telerik,
   I'm a telerik user ,i encountered a problem when i used the gridview Control in my gui,i have two question as following:
  1>i just want to set the height of the header in the gridview,but i can't find out  which property should be set,could u pls give me an example  about how to implement it ?
  2>and another question ,when you set up a relation in the gridview ,and the childtable will be displayed in the current record,you will find a plus(+) image in the first cell ,i want to replace the plus(+) image with my image ,and how to implement ?
 thanks for you help and support

 

Hi,

Before I beat myself silly,  Is it possible in WinForms to have nested MDI parents. Or in other words a MDI child that is also a MDI Parent.

Hello,
In design I am adding Item 10 to TabStrip collection.  I have named it TabOnline, however the ContentPanel name is TabItem1.  However if I select the tab and then the content panel, it is correctly called TabOnline.  Also, in the code it does not know the tabitem TabOnline.  I've tried deleting and readding the item and tried a different name too.  I've even tried keeping the tab the default of TabItem1, but it still is not available in code.
I did install Q3 yesterday.
Thanks.

I'd like to put in a vote for a ListView control , I myself and many people I know still find using listviews very useful especially with their capacity for multiple style views. Possibly also a TreeListView like the silverlight suite has too ?

I'd love to see versions for winforms and for wpf .

I've got an empty winform where I want to drag and drop the new radgridview Q3 2009. But when dropped I'm getting a messagebox with the following error:

"No such property registered: IsMouseOverScrollBar, Telerik.WinControls.UI.RadScrollBarElement"

Before doing this I inserted all .dll files into visual studio 2008 into a new tab called "Telerik Q3 2009". I've got another tab called "Telerik Q1 2009" with those controls that I'm currently using in my prototype.

Now I looked in the folder with the new dll"s, trying to find this element, but couldn't find it. I also didn't find this element in the "Choose Items". So I don't think that I missed a dll file to import into visual studio.

Any solutions?
Thanks

I trying implement a Shift-F10 key to activate the ContextMenu.  I have the Key trapped inside the KeyDown Event, but I don't know how to activate the ContextMenu.  RadGridView.ContextMenuStrip is Nothing.

2009Q2 (2009.2.9.729), VS 2005 (v8.0.50727.762 SP.050727-7600), .Net2 (2.0.50727), XP SP3, Core2Duo 2.99GHZ with 3GB.

We're trying to automate testing of the WinControls using a couple of different tools (QTP and Project White) .  These tools use the Microsoft UI Automation framework.  We are using UI Spy to find Telerik controls in our WinForms application and they don't show up. 

We have an immediate need for UI automation.  What are your plans for providing support for Microsoft's UI automation framework?