Button is clicked only on double click

Hello,
I have a button and this is activated only on double click.
it is about the ovverride function “onMouseButtonDown”, but i need this function, so i can not delete this.

I was in many threads and found no answers about this issue
Can some1 help me?

253037-adsd.png

never seen this node.
Where do i have to rope it and what do i have to change on this function?

my game is a topdown game. I can drag and click other things with one click, because they do not have the function “on mouseButton Down”.