Comments on: Silverlight GroupBox control

By: Balaji

Balaji — Fri, 21 Oct 2011 11:44:35 +0000

Hi Tim,
Thanks for Your Reply.
1)My Aim is to create a common code base and apply in different Versions that is Silverlight and WPF.
All my views will be in a common place.That is why i was asking you that will it work in WPF?
2)Iam Getting Error Like the object Reference not set to instance as obvious that that the controls are null
private RectangleGeometry FullRect;
private RectangleGeometry HeaderRect;
private ContentControl HeaderContainer;
The Above Three controls are in null thats why i think we are getting this error.
Can you pls suggest indeed i had used all the files that you said.

By: Tim Greenfield

Tim Greenfield — Thu, 20 Oct 2011 15:58:23 +0000

@Balaji,
A) WPF comes with a GroupBox control already so I’d recommend using it instead.
B) I just tried the binary & c# source and they worked fine in SL4. Make sure you “unblock” the zip file before you extract the files and make sure you leave the entire Groupbox project intact. You need both Groupbox.cs & themes/generic.xaml. Also, if you rename the project you’ll have to update the generic.xaml.

Hope that helps, Tim

By: Balaji

Balaji — Thu, 20 Oct 2011 13:11:22 +0000

Hi
Thanks for your Article.
I have two concerns here
A)Will it work in WPF As well?
B)Iam getting error in ApplyTemplate as object reference not set to instance.
Am using silverlight 4 version here .
How to debug the above error and fix it?

By: swapnil

swapnil — Fri, 05 Aug 2011 04:40:53 +0000

mail me the solution at swapnilsrivastav70@gmail.com

By: swapnil

swapnil — Fri, 05 Aug 2011 04:40:06 +0000

Hi i have used your groupbox in my application but it is throwing the undermentioned error and making my design window uneditable although on debugging it throws no error but as design window gets disabled its difficult to design further.

Object reference not set to an instance of an object.
at GroupboxControl.GroupBox.OnApplyTemplate() in C:\Documents and Settings\ICS718965\My Documents\Visual Studio 2010\Projects\Tachoweb Sign Up\GroupboxControl\Groupbox.cs:line 38
at System.Windows.FrameworkElement.OnApplyTemplate(IntPtr nativeTarget)

By: david

david — Wed, 23 Mar 2011 06:44:18 +0000

i couldn’t put more than one control in group box suppose include one label, error arise when i put next control.

By: Eniak

Eniak — Mon, 14 Mar 2011 19:43:55 +0000

I’m using this magnificent lightweight Groupbox even in my WPF applications instead of the normal one, because it gives a way better performance in scenarios when the controls are being resized by the user. Great job!

By: Girish Talekar

Girish Talekar — Thu, 10 Feb 2011 08:52:57 +0000

Is the tabindex problem solved ?
i have the same problem, i set the IsTabStop=”False” of groupbox but i still getting the focus on groupbox and tabing again it is going on control.

By: devneko is not cat. › WPFからSilverlightへの変換で苦労したところ

devneko is not cat. › WPFからSilverlightへの変換で苦労したところ — Tue, 25 Jan 2011 13:08:52 +0000

[...] フリーのGroupBoxライブラリを手に入れるか自分で作る [...]

By: Tony

Tony — Mon, 20 Dec 2010 19:53:17 +0000

Hi Tim. Thank you for your GroupBox control. It’s almost exactly what I want.

Greg Lusk asked a question and it does not seem to have been aswered.

When I use a Border control to enclose a couple of text boxes and loop through the Visual Tree, the text boxes can be accessed and manipulated. However, when I replace the Border control with your GroupBox control, which is how I want to form to look, and loop through the Visual Tree, the text boxes are not picked up and I cannot manipulate them. For example, one might want to clear both text boxes generically – I am wanting to do much more complicated things with the text box controls though.

The GroupBox control seems not to expose the child controls. Can the GroupBox be converted to do everything a Border control does as well as adding the label?