Embedded user input text field - how to avoid hitting shortcuts?

Hi guys,

I need your help!
In my SolidWorks Addin (written in Object Pascal) I'm creating an own Featuremanagerwindow using the method ModelViewManager.CreateFeatureMgrWindowFromHandlex64.
The handle passed to this method is a form (TForm) with a Treeview to show the component structure of the opened document as a BOM. There's also an input textfield (TEdit) I want to use as a filter to hide/show the matched nodes.
As soon as I type something into the edit field SolidWorks is catching the letters and triggers the (assigned) shortcuts. The letters without a shortcut are no problem, the other ones don't even arrive the edit field.
My SolidWorks is the 2014 x64 SP04 Edition.

Tried everything without success, Google didn't help me either.

Is there a way to disable shortcuts or any other solution so that I don't have to create a keyboard hook?

SolidworksApi macros