how to get back to browse tool via script?

[Tiemo Hollmann TB]

Hello,

I have a button to give the user the chance to choose the brush tool. After
finished the paint job the user should choose again the browse tool.  BUT
with the brush tool active no button is triggert any more. Nor can I change
the tool back again automatically by "mouseenter", because mouseenter isn't
triggert either any more. What am I missing?

Thanks for any hint

Tiemo