Update raster image display issue

I have an application I'm building using the example code from Bentley that allows you to draw linestrings.  I am using the ExampleCreateLineStringTool::_OnDataButton (DgnButtonEventCR ev) method and in it I am doing a window center after each point drawn on the line using mdlView_newWindowCenter (perhaps there is an new Microstation API function for this?).  However my issue is with raster imagery attached as the window re-centers the imagery does not always refresh in the area of the new view that was just updated.  My question is there a way to force this update to the raster imagery?