Button Confusion

Hello.
I am having trouble creating buttons in Saola.
Attached is my project file. I have created a button with 2 states mouse down and mouse up these set the visibility of each layer in the symbol.
So when I import this button as a symbol and place an event on it it cancels out the MouseDown and MouseUp events in the symbol.
Can you please explain what I am doing wrong here?
Cheers
Deek
ButtonTest.zip (16.2 KB)

Thank you HaiYen_vu.
It works now. I had indeed created two symbols accidentally.
Thanks for your support.
Cheers
Deek