How to Change Text of Button 1 When Button 2 is clicked

I have a button 1 which has a Dynamic Attribute Inner Text

I have a button 2 which has a Dynamic Event Mouse Single Click
In Dynamic Event Actions i can only see the following “Available Actions” for both my buttons
Set Value
Disable
Validate
Focus

How to access the dynamic attribute Inner Text of Button 1 in the Dynamic Event Actions of Button 2 so i can set it ?