TGEA 1.7.1] Some Fix MessagePopup.

When set window title, you saw this error message.

here :

tools/gui/messageBoxes/messageBox.ed.cs (249): Unknown command setText.
  Object MessagePopFrame(1517) MessagePopFrame -> GuiWindowCtrl -> GuiContainer -> GuiControl -> SimGroup -> SimSet -> SimObject

i edited 'tools/gui/messageBoxes/messageBox.ed.cs' around 131 and 152 and 249 line.

???.setText(%title);

change to

???.Text = %title;

Cheer up!!