There are several issues related to focus in Marina.
The attached test has a couple of comboBox and several check boxes. Clicking on the different items in the 2nd comboBox adds a corresponding slider into the UI.

1)Click on the first combobox drop down arrow - It does not drop down.
2)Click on the first combobox in the text region of the combobox - Only a part of the combobox is responsive.
3)Click on second combobox - It does not respond to mouse clicks at all.
4)Tab into the 2nd combobox and press down arrow to change the selected item - A slider appears adjacent to the combobox. Try to click and drag the slider thumb - nothing happens.

This is a regression in marina from franca.