Thanks for the suggestion on the dropshadow effects. will try that.
The problem is that there are few blocks cut off on both sides (east and west side). the lower the screen resolution, more blocks cut off. about 1km of area on both sides not displayed on the current resolution. on a wide screen monitor, less area cut off. the map service has been recreated, refreshed many times since the app was built. The problem is always there.
feels like the map is loaded into the parent grid rather than grid.column=1