Response to mouse click by combo box list and underlying clickable label

Hello,
we developed a label responding to a mouse click by opening and thereby displaying an associated help text. The label extends a project specific hierarchy of labels and thus implements MouseListener, of course. Now we encountered a strange problem: It occurs when a combo box is placed above such a label in a panel. By clicking the combo box a selective list drops down and covers the label. As soon as a mouse click is performed on a list item directly covering (i.e., right in front of) the clickable label not only this item is selected but the help screen associated with the underlying label is displayed, too. So the mouse click is processed twice: as proposed by the combo box and unwantedly by the label. This behaviour could not be reproduced on other components being placed below a combobox. So the label itself seems to be the cause but we cannot imagine what could exactly be the reason for this double reaction. Perhaps anyone heard of something like that?
We are currently working with IBM Visual Age for Java 2.0 (Java version 1.1.8 with the according Swing version). The clickable label reflectively calls methods of a model to determine whether help is available and if so later on to open this help text.
Any help is appreciated!
Danilo

Thank you for your response. I tried both to check the focus and to consume the event. But I had to learn that labels are not able to catch the focus. I also was not able to consume an appropriate event of the combobox. So I finally solved the problem by extending JButton and implementing ActionListener. Thus my labels are actually buttons but I changed their appearance and behaviour so one cannot distinguish them from labels.

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Response to mouse click by combo box list and underlying clickable label

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