How to switch of the line selection tool in VBA

Hi,

Does any one know how to switch off the line selection tool in a sheet.

I created a set of pivot tables in Excel and control them with a VBA program. Works super.
However ones and a while I have an error. I found out that this error only occures when I'm not fully on my cell with the cursor when the VBA is started..
Excel then shows the symbol for the line selection tool ( a black flat arrow) instead of the big white cross and has then a blank selection field in VBA

Does any body know how to switch this off in VBA?