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TabPage crash in design time with child controls

Hi all!
I'm trying to implement my custom designer.
Custom designer is loaded inside Visual Studio 2008 like a toolwindow using VSPackage.

My design surface is successfully created and i can set controls inside it.

This is the problem: I have a TabControl that could have many TabPages and inside of each of the many other controls (also custom controls).

No problem when i load controls on the first TabPage (or in a TabControl with only one TabPage).

I've got problems when TabControl has many TabPages, for example 2, and when i try to select one of them. The first one is successfully running with design-time behaviours of controls, but selecting other TabPagesVisual Studio crashes.

Is it a bug?
Am i doing something wrong?

Here some code.

Here i create a new TabPage:

TabPage ctrTabPage= new TabPage(nameCaption);

Here i add it to the TabControl:

ctrTabControl.TabPages.Add(ctrTabPage);

Here i create a new control (is a custom control):

controlToAdd= (Control)mDesignSurface.CreateControl(controlType);

Here i add the control to the correct tabpage:

ctrTabPage.Controls.Add(controlToAdd);<br/>

I can't understand the problem. All works only for the first tabpage, crash selecting others.

Has anyone an idea?

Thanks!

- Matteo Garzulino -

Matteo Garzulino Monday, March 30, 2009 10:31 AM

After few test, i realizedi've got the problem onlywith my custom controls, defined like this:

[Designer(typeof(ControlDesigner))]

public class AlphaNumericTextBox: TextBox

{



        public AlphaNumericTextBox()

        {



  

        }



}

No problem with "native" Windows Forms controls.

Anyway, anysuggestion is still welcome! ;)

- Matteo Garzulino -

Marked As Answer byBruce.ZhouMSFT, ModeratorFriday, April 03, 2009 10:08 AM

Matteo Garzulino Tuesday, March 31, 2009 11:30 AM

After few test, i realizedi've got the problem onlywith my custom controls, defined like this:

[Designer(typeof(ControlDesigner))]

public class AlphaNumericTextBox: TextBox

{



        public AlphaNumericTextBox()

        {



  

        }



}

No problem with "native" Windows Forms controls.

Anyway, anysuggestion is still welcome! ;)

- Matteo Garzulino -

Marked As Answer byBruce.ZhouMSFT, ModeratorFriday, April 03, 2009 10:08 AM

Matteo Garzulino Tuesday, March 31, 2009 11:30 AM

Ok, I foundthe bug!

On my custom control i had an override of OnEnter().
Inside the override there was this code:

        protected override void OnEnter(EventArgs ea)
        {

            //Other code...
            base.OnEnter(ea);
            if (this.CanFocus)
                this.Focus();
            //Other code...
            Invalidate();
        }

This caused a WindowsMessage Code 8: KILL_FOCUS.

I don't know why, overriding OnEnter() and calling this.Focus() inside it cause this message and then crashing my design-time with custom controls.

If anybodyknows anydetails about KILL_FOCUS, you're welcome

Bye!

- Matteo Garzulino -

Matteo Garzulino Thursday, April 09, 2009 12:46 PM

You can use google to search for other answers

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