Buttons verschwinden nach dem ich minimiert habe

Hallo hab ein kleines Problem.
Wenn ich meinem Webplayer minimiere und wie maximiere werden die Buttons , Label und Volumen Control nicht angezeigt bis ich mit der Maus einmal darüber fahre.
Kann mir jemand helfen?

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#Region ;**** Directives created by AutoIt3Wrapper_GUI ****
#AutoIt3Wrapper_Icon=..\MHFMico.ico
#AutoIt3Wrapper_UseX64=n
#AutoIt3Wrapper_Res_Fileversion=1.0
#AutoIt3Wrapper_Res_Language=1031
#EndRegion ;**** Directives created by AutoIt3Wrapper_GUI ****
#include <GUIConstants.au3>
#include <ComboConstants.au3>

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Const $urlmusichouse = 'http://www.musichouse-fm.de/fusion/flashplayer/m3u.php?streamURL=http://188.138.84.93:7100'

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$oWMP = ObjCreate ( "WMPLayer.ocx" )
$oWMP.URL = $urlmusichouse
$oWMP.controls.stop()

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GUICreate("Musichouse FM Player",500,180)
$bStart = GUICtrlCreateButton("Start",20,40,100,30)
$bStop = GUICtrlCreateButton("Stop",140,40,100,30)
$bHP = GUICtrlCreateButton("www.musichouse-fm.de",260,40,220,30)
$bchat = GUICtrlCreateButton("Musichouse FM Chat",260,80,220,30)
$bregister = GUICtrlCreateButton("Musichouse FM Register",260,120,220,30)
$combo = GUICtrlCreateCombo("",20,80,220,60,$CBS_DROPDOWNLIST)
GUICtrlSetData($combo,"Musichouse FM","Musichouse FM")
$slider = GUICtrlCreateSlider(20,120,220,30)
GUICtrlSetData($slider,$oWMP.settings.volume())
GUISetState()
$label1=GuiCtrlCreateLabel("created by Iceshaker",10,160,110,15)
$label2=GuiCtrlCreateLabel("Ver. 1.0",450,160,40,15)
$Pic = GUICtrlCreatePic(@ScriptDir & "/Bg.dat", 0, 0, 500, 180)
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $bStart
$oWMP.controls.play()
Case $bStop
$oWMP.controls.stop()
Case $bHP
ShellExecute("http://www.musichouse-fm.de")
Case $bchat
ShellExecute("http://www.musichouse-fm.de/chat2/flashchat.php")
Case $bregister
ShellExecute("http://www.musichouse-fm.de/register.php")
Case $slider
$oWMP.settings.volume = GUICtrlRead($slider)
Case $combo
$oWMP.controls.stop()
Switch GUICtrlRead($combo)
Case 'Musichouse FM'
$oWMP.URL = $urlmusichouse
EndSwitch
$oWMP.controls.play()
EndSwitch
WEnd

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