Refreshing DBControls

[kike]

I've been working on a sub that refresh a DBgrid, populating it on a selection made in another DBGrid, but now i need to do this in both ways, select from the second DBGrid and refreshing the contents of the first DBGrid.
Even all the DBControls could also need to match the selection. (The source are Data Environment commands)

Can someone help me? I would appreciate any idea.