You can achieve this using variables an triggers. For instance you can call your variable vShowObject, and set a trigger to change the value of this value when you hit the button:
1. To create variable: Go to Settings -> Variable Overview -> Add
2. To add triggers, just go to Actions tab -> Add. In action type chose External in Action field select "Set Variable". Then define the variable an value:
3. In the properties of the object that you want hide/show, go to Layout tab and add the following condition:
For the other button you just have to set your variable value to LB07, and also use this value in the other object condition.
Hope it helps.