I've figured out how to fix (freeze) the first 3 columns in my grid so that they don't move when scrolling, but the control is adding a thumbtac icon to the header that the user can click/unclick to change the fixed property. Is there a way to remove this so that the user cannot change this at run time?
The property you are looking for is the FixedRowIndicator property on the Override.
What do I have to do, to make the thumbnack only to be visible when the mouse is hovering? I only want the thumbnack to be visible when it is pinned or if the mouse cursor is hovering over it. Is there a property for that?
Hm, I don't think there's an easy way to do this. You might be able to acheive this using a DrawFilter, but there's no property as far as I know.