Why LeftMouseButton can't trigger OnMouseButtonDown ??

it will only show “right” ,and with no refection if i click LeftMouseButton…

this is a button ,and if i use image it will trigger LeftMouseButton,so,whats wrong with button??

I believe you’re facing the same issuethat pops up when we try to drag a button with left mouse button. Overriding the “On Preview Mouse Button Down” function instead of On Mouse Button Down, fixed the problem for me.

oh!!! thank you sooooooo much !!! this problem spends me more than 5 hours for googling !!! really thank !!