Reference a window property with another property

Is it possible to reference a window property with another property? For example, if I have an integer property named A1, and a second integer property named A2, is it possible to create a third property that points to either A1 or A2. I cannot use arrays in this case.

Looks like you may want to have the third property function as a pointer. One way to achieve this would be to use a Computed Property. Here is a link to a helpful Xojo Blog post that discusses Computed Properties:

Using Computed Properties and Method Assignment
Published September 4, 2013 by Paul Lefebvre

If the third property is A3, then A3 is created as a Computed Property. Depending on your program logic, you could either use the Set method to toggle A3 accordingly, or the toggling could be done in the Get Method.