MATLAB: How to get the handle of a selected object

guiMATLABselected object handle

I have made a GUI with 42 (14×3) editable text objects to input numbers. Rather than having 42 callback functions I have made a matrix of 14×3 handles. Using this matrix I can set all the properties of any preselected editable text object.
However, if the user clicks on one of the objects and enters something I am lost, I do not know which object has been selected, although, depending on the content, I want to make changes on the object (let's say changing the background color if the user hits a special key after entering a number).
Is there any way to get info about the object which was selected? It would be nice to have a function giving back the handle of the selected object.
Csaba