I copied and pasted a button 4 times.
I renamed 3 of them btnTest1..3
I was unable to access the 4th button, although I could see it in the Abstract Designer.
I closed and re-opened the project.
The 4th button was no longer visible in the Abstract Designer.
However it is listed in the tree, called btnTest3.
There are 2 buttons with the same name.
One of them in not accessible.
I attach a zip of the project.
I renamed 3 of them btnTest1..3
I was unable to access the 4th button, although I could see it in the Abstract Designer.
I closed and re-opened the project.
The 4th button was no longer visible in the Abstract Designer.
However it is listed in the tree, called btnTest3.
There are 2 buttons with the same name.
One of them in not accessible.
I attach a zip of the project.