Custom cell, not responding to mouse clicks

I have a CellTable with a custom cell that extends AbstractCell and overrides the render method for displaying its data. The problem is that I can't click inside the actual cell to select it, I have to click somewhere outside the cell. The default color change on mouse hover also does not work within the actual cell. I am using a SingleSelectionModel to display a popup when I select something in the cell table. What do I need to do to make my cell respond to clicks and handle the mouse over effect?

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