Steps to reproduce issue:

1. Use the wallet that has a Masternode collateral locked.
2. Open Coin Control in Tree mode, click Toggle lock state button.
3. PIVX-Qt popup window will show up saying "Please switch to "List mode" to use this function."
4. When you click OK, Toggle lock state button will be "pressed" (it switched from OFF to ON although the error window appeared).
5. If you don't go press it again, it will stay "turned ON".