Delphi’s TGridPanel control is an ideal pick when you want to create grid-flow like user interface layout for your controls.
To place controls on a grid panel you specify the number of rows and columns (RowCollection and ColumnCollection properties) and simply drop a control on it. Unlike standard TPanel, when you drop a control on a GridPanel it will be placed in the next available empty cell in the grid. As you add more controls the grid will grow either by rows or columns being added automagically (or not, if the ExpandStyle poroperty is set to emFixedSize). What’s more you can even determine how each cell will be sized: will it have a fixed size, or a percentage of the grid size – so you can have controls nicely uniformly distributed in a grid.
That’s all great when you know the design at design-time – and you know what number of controls you want to be hosted by the grid panel.
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The second law of thermodynamics, in short version and when read by a programmer, states that “any collection of objects tends not to be sorted” 🙂
In one of my applications, a tab on the page control hosts a TWebBrowser displaying PDF (and other supported) documents. Having the “PDF View” tab active, other tabs of the page control are hidden from the user – as this is how the page control functions.
I’m sure you’ve seen it already. When the program starts it takes a picture of the current desktop, the picture is then cut into a number of rectangular pieces (all of the same size). A piece at some random position is “removed”. The main code randomly swaps that piece with the one next to it. Only pieces adjacent to the removed one can be moved into it.
Ah, nostalgia.
Finally, last step in making my (/your) Delphi application not only 
