RequestFile gives up!

I have a problem with RequestFile.

I wouldn't normally write so much code but im not sure which part is messing up the rest so i'm gonna have to.

Function createAddWindow(parent%, parentIPath$)		;CREATES A WINDOW FOR THE USER TO ADD A NEW DIRECTORY OR FILE 

	addWin = CreateWindow("Add", ClientWidth(Desktop())/2-170, ClientHeight(Desktop())/2-102.5, 300, 205, window, 1)
	addPanel = CreatePanel(0, 0, ClientWidth(addWin), ClientHeight(addWin), addWin)
	rdoAFile = CreateButton("File", ClientWidth(addPanel)/4-20, 10, 40, 20, addPanel, 3)
	rdoADir = CreateButton("Dir", ClientWidth(addPanel)/4*2-20, 10, 40, 20, addPanel, 3)
	SetButtonState rdoAFile, 1
	lblName = CreateLabel("File Name:", 10, 40, 100, 20, addPanel)
	lblPath = CreateLabel("File Path:", 10, 70, 100, 20, addPanel)
	txtAName = CreateTextField(110, 40, 170, 20, addPanel)
	txtAPath = CreateTextField(110, 70, 170, 20, addPanel)
	btnAddBrowse = CreateButton("Browse", ClientWidth(addPanel)-93, 100, 80, 20, addPanel)
	chkAHid = CreateButton("Hidden", 30, 100, 100, 20, addPanel, 2)
	chkARdo = CreateButton("Read Only", 30, 120, 100, 20, addPanel, 2)
	btnCompAdd = CreateButton("Add", ClientWidth(addPanel)/2-83.5, 145, 80, 20, addPanel)
	btnAddCan = CreateButton("Cancel", ClientWidth(addPanel)/2+3.5, 145, 80, 20, addPanel)	
	
	While WaitEvent()
		If EventID() = $401
			If EventSource() = rdoAFile Or EventSource() = rdoADir Or EventSource() = rdoUnin
				If ButtonState(rdoAFile) = 1
					SetGadgetText lblName, "File Name:"
					SetGadgetText lblPath, "File Path:"
					EnableGadget lblPath
					EnableGadget txtAPath
					EnableGadget chkAHid
					EnableGadget chkARdo
					EnableGadget btnAddBrowse
					SetGadgetText txtAPath, ""
				Else If ButtonState(rdoADir) = 1
					SetGadgetText lblName, "Directory Name:"
					SetGadgetText lblPath, "Directory Path:"
					DisableGadget lblPath
					DisableGadget txtAPath
					EnableGadget chkAHid
					EnableGadget chkARdo
					DisableGadget btnAddBrowse
					SetGadgetText txtAPath, "n/a"
				End If
			End If
				
			If EventSource() = btnCompAdd
				If TextFieldText(txtAName) = "" Or TextFieldText(txtAPath) = ""
					Notify "Please fill in all the text fields."
				Else
					f.file = New file
					If ButtonState(rdoAFile) = 1
						f\typeFile% = 1
						endChr$ = ""
						iconNum% = 1
					Else
						f\typeFile% = 2
						endChr$ = ""
						iconNum% = 0
					End If
					f\name$ = TextFieldText(txtAName)
					f\ID% = AddTreeViewNode(f\name$, parent%, iconNum%)
					f\path$ = TextFieldText(txtAPath)
					f\iPath$ = parentIPath$ + f\name$ + endChr$
					f\hidden% = ButtonState(chkAHid)
					f\readonly% = ButtonState(chkARdo)
					ExpandTreeViewNode parent%
					FreeGadget addWin
					Return
				End If
			End If
			If EventSource() = btnAddCan
				FreeGadget addWin
				Return
			End If
			If EventSource() = btnAddBrowse
				fileR$ = RequestFile("Add File:", "")
				If fileR$ > ""
					Repeat
						pos% = Instr(fileR$, "", oldPos% + 1)
						If pos% = 0
							pos% = oldPos%
							Exit
						Else
							oldPos% = pos%
						End If
					Forever
					length% = Len(fileR$)
					fileName$ = Mid(fileR$, pos%+1, length%-pos%)
					SetGadgetText txtAName, fileName$
					SetGadgetText txtAPath, fileR$
				Else
					Notify ""
				End If
			End If
		End If
		If EventID() = $803
			Exit
		End If
	Wend
	FreeGadget addWin
	Return
		
End Function

I did a bit of editing so it may look a bit wierd! Anyhoo, i can run this and to my TreeView i add with the browse button:

A file;
A dir;
A file;
A file;
A dir;
A dir;

but when i go to add the next file (and annoyingly my last) it just notifies "You didn't select a file". I don't thnik it matters how i add the files or how many i add. Is there anything wrong with the code that would make it cause an error with RequestFile?

Thanks to anyone who can help.