Web appli crash without information

[quote=201571:@Marc Couraud]Could not execute returned javascript: Cannot read property ‘children’ of null
Source: new webcanvas(‘LOxy2lIx’,[‘GotFocus’,‘KeyPressed’,‘LostFocus’,‘MouseDown’,‘Open’,‘Shown’]);
Are you certain that this was the whole error? This looks to be the first few lines of an otherwise much longer error.

Many thanks to Brock

and Greg !

We have put the control’s initialization in the shown event instead of the open event, and all the issues are solved !