how to select an element while Window form is running

[kukuzry]

In the C# window form, there is a button.

What i want is that if I press the button, I can select an element in Revit model, and then return to the window form.

I tried "winForm.hide()", but it still does not allow me to select the element even if the window form is hidden.

Could anyone suggest how to implement this function? or sample code?

[ColinStark]

If I understand what you're trying to accomplish, you'll probably need to use a modeless form in conjunction with an ExternalEvent or the Idling event.

This should point you in the right direction: http://thebuildingcoder.typepad.com/...al-events.html
Another on the same topic: http://thebuildingcoder.typepad.com/...nal-event.html