Some questions about the GUI

I've some questions about the GUI and may they are noob-questions but i realy don't find the solutions about them.

First problem:
In the default "startMissionGui.gui" of TGE there is a line which loads the map names in a list where you can select them to start it.

Quote:
new GuiScrollCtrl() {
profile = "GuiScrollProfile";
....
};
new GuiTextListCtrl(SM_missionList) {
profile = "GuiTextArrayProfile";
....
};

and the function on the button (i don't paste it in here, it needs too much space.)

Now i made our one .gui file and i want the same list of maps in it.
But there are no maps in our list.
I looked through the hole gui file but with no result for a solution.
Is there anything wrong with the function? Do i have to change something because of the different file name?

Second problem:
The file "demoWindow.png" has the bitmaps for the windows in the GUI.
For our Game we need other colors and an other style but everytime i change the file
there is an error from torque.
How can i make my own "window-bitmap" files or how can a change the original one?
And where is the logic how is this file interpretated?

general:
I'm searching for a detailed GUI-tutorial not just the basics.

The first thread ;)

thanks for answers
greetz
Tobias Rieder