For the scenario as described, the following code can be put in MainForm_Load so that mouse clicks do not halt a redraw.Dim cancelTracker As ESRI.ArcGIS.esriSystem.ITrackCancel cancelTracker = Me.axMapControl1.TrackCancel() cancelTracker.CancelOnClick = FalseThere is a snippet and lots of samples at the following location (for the engine developer) ms-help://MS.VSCC.v90/MS.VSIPCC.v90/ESRI.EDNv9.3/esriSystem/html/ITrackCancel.htm