I would like to ask about the Check All function in using listbox. I usually leave Check All aside. But when I looked at the sample of ASP.NET (Teleik), I saw that they were tied together.
Is this even possible in WPF? What conditions are required for that?
There are two possible approaches for achieving the desired result - to edit the control template of the RadListBox control or to create an attached behavior in which you can modify the composing elements and add the CheckBox programmatically.
Please note that in both cases, the required modifications may be different based on the theme you're using.
For your convenience, I've prepared a small sample project which demonstrates how to achieve this via an attached behavior for the Office Black theme. If you're using another theme and this approach does not work for you, please let me know which theme(s) you use and I will gladly try to update the solution to work for your particular scenario.
Regards,
Dilyan Traykov
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Thank you for the provided images. The reason for the undesired behavior with the selection is that the CheckBox does not stretch to the whole RadListBox item. To achieve this, you need to remove the default padding for the Items and transfer it to the CheckBox. As for the missing scrollbar, this is because the StackPanel has an infinite height. Please excuse me for overlooking this. This issue can be resolved by replacing the StackPanel with a Grid panel. For your convenience, I've gone ahead and applied both these modifications to the attached project. Please have a look and let me know if it provides the desired result.