Grigbag, how to dynamically locate and replace components??

Hi there :)
The thing is. I am making a projectplanner kinda program. What i want is to use a gridbag layout. Then i want to make the size of the gridbag panel depend on the lengt of the active project, and with the lenght of on field per day. This works great.
Then i want to add a component in all the "empty" fields, this component has a set size, and the only visible thing here is the right border. this way i have a table kinda thing that dynamically changes depending on the projects size.
However now i want to add my projects. The idea was for the projects to be coloured JPanels with a name. And they would have to be placed according to their create date and deadline.
The problem is:
when i have calculated the field from which i want a certain "project" to be added. there is allready an emptyfield panel... How do i replace the first panel with the new one?? is it even possible? or am i simply too much of a noob :)
I really hope you can help me!!

thanks. but how about the constraints?? am i wrong in thinking that i have to use them in order to place my components at the right places??

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Grigbag, how to dynamically locate and replace components??

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