TcxGridSite - Drag

I've a
problem with testing an appliction that uses DevExpress QuantumGrid:

When I try
to use TcxGridSite.Drag to group some columns everything works fine using single-step
execution. However if I try to run a whole script it fails waiting for some
particular window. Tried all kind of WaitVCLObject, WaitWindow, Delay etc. - no
success. Finally I found, that it might have to do with the hint-message that
quantum grid is showing containing the column header if the column is small. Maybe
that hint-window prevents the TcxGridSite window to be activated. Any
suggestion how I can avoid this problem?

Txs PMM