I am creating a Project Manager using wxPython it has a splitter window. On one side is a tree that shows the names of and opens the files and on the other size is a textctrl that is used to edit the file.
One problem I am having is that I would like it to go back 4 spaces when SHIFT and TAB are pressed, I have code working that add's 4 spaces when TAB is pressed.
I am also have a problem that when I add a file that is in a different folder to my programs cwd the tree adds a new node and the file appears under this node and I am struggling to get the tree to save to a file. 
Also I would like to know how to add an icon to an item in the tree from an external png file.
I would appreciate any help that could be given with either of these problems.
I don't know use WxPython and so don't have much idea about it. But in general what you can do is whenever a key is pressed, call a callback function and you could get the time when the key was pressed. save it somewhere. And when the next key is pressed, get the time. compare both times, if there's not much significant delay (you can decide the delay), it means that both the keys were pressed simultaneously (although they were not).
Multiple key press detection wxPython