You could redraw a the tile. Create a bmap during runtime with the customized values and use that on your panel. I don't see the reason why to waste rendering time for these lines as long as you don't zoom in (otherwise, ventilator's suggestion would make more sense).

it should be quite easy. probably the most difficult thing is setting up the compiler and linker (i always hate that! ).

in the manual there is an example for a dllfunction which draws a triangle. drawing a line would be almost the same. you will need two vertices only and i think instead of trianglefan you have to use the linelist mode for drawprimitiveup.

Okay....I will look at this tutorial. Thanks!

@ HeelX

Again...which beta are thinking of? (A7 or a version above 6.5)

Redrawing the tile is a good idea....it would save rendering time and BMAP memory.
But I need this Size repeating......

@ventilator

I don't find the libraries in the Properties....

(When using VC++ 2005, you also need to tell the linker not to use the libc.lib that was abandoned by Microsoft. Thus, ignore the specific library libc.lib in the project properties for Debug and Release, and add libcmt.lib to the Linkers Additional Dependencies.)

This feature has been introduced in V6.58.b beta - released 19-Feb-2007

--> see beta page! http://www.conitec.net/beta/

As I can't get the beta now (I think) do you know when the next public version is released?