Panel mousedown event problem

Hello again. I have this problem with the panel.mousedown event. The thing is, that I have to move around my mouse within the panel for the mousedown event to update. This is really annoying as I try to make a tile creator. I have to move the mouse and click at the same time for the tiles to be added. I would guess that it has to do with the .mousedown method just updating when my cursor is inside the panel and moved around. I've been searching on google for 'global mouseevents' which I can use within a timer. I havn't found anything.

I hope you understand my problem and can help me, thanks.