Wait for available control

[NoblePrimus]

I am writing a script to login to an application, I have several windows that pop up but I want to wait until certain controls are visible before proceeding. Right now I am using sleep to wait but I want to try and have the script run as fast as possible.  Right now I am using a while command but it is not working the way I want it to. I am still fairly new at AutoIT scripting and thought there as a better way to do this. 

Local $hWndWt = WinWait("[CLASS:ThunderRT6MDIForm]")
Local $sTitle = WinGetTitle("[ACTIVE]")

;Wait for Control
While ControlGetHandle($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]") = ""
  sleep(1000)
WEnd

If ControlCommand($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]", "IsEnabled", "") Then
    Send Username and Password
    ControlSend($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]", @UserName, 1)
    Sleep(3000)
    ControlSend($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:6]", "Password", 1)
    Sleep(3000)
    ControlFocus($sTitle, "", "[CLASS:ThunderRT6UserControlDC; INSTANCE:18]")
    Sleep(3000)
    Send("{Enter}")
EndIF

I would appreciate any assistance.

[Luke94]

How about a Do... Until loop?

Local $hWndWt = WinWait("[CLASS:ThunderRT6MDIForm]")
Local $sTitle = WinGetTitle("[ACTIVE]")

;Wait for Control
;~ While ControlGetHandle($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]") = ""
;~   sleep(1000)
;~ WEnd

Global $g_iInteger1 = 0

Do
   $g_iInteger1 += 1
   If $g_iInteger1 >= 500 Then ; Prevent the Do.. Until.. looping forever. 500 x 10ms = 5000ms = 5 seconds
      ExitLoop
   EndIf
   Sleep(10) ; Sleep for 10ms
Until ControlCommand($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]", "IsEnabled", "") = 1

If ControlCommand($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]", "IsEnabled", "") Then
    Send Username and Password
    ControlSend($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:7]", @UserName, 1)
    Sleep(3000)
    ControlSend($sTitle, "", "[CLASS:ThunderRT6TextBox; INSTANCE:6]", "Password", 1)
    Sleep(3000)
    ControlFocus($sTitle, "", "[CLASS:ThunderRT6UserControlDC; INSTANCE:18]")
    Sleep(3000)
    Send("{Enter}")
EndIF