I sometimes add a global variable called "User_Can_Click" with 0 = no and 1 = yes.
After the user clicks on an object (and also check that User_Can_Click=1), set User_Can_Click = 0.
Then, have an event somewhere in your Event Sheet that says "Every .25 seconds->Set User_Can_Click = 1"
That little .25 seconds will be enough that your click won't go through to multiple objects and the user won't notice.