void createHandle() {
handle = OS.gcnew_StackPanel();
// handle = OS.gcnew_ContentControl ();
if (handle == 0) error(SWT.ERROR_NO_HANDLES);
int animation = OS.gcnew_DoubleAnimationUsingKeyFrames();
if (animation == 0) error(SWT.ERROR_NO_HANDLES);
int timespan = OS.gcnew_TimeSpan(6000000);
if (timespan == 0) error(SWT.ERROR_NO_HANDLES);
int duration = OS.gcnew_Duration(timespan);
if (duration == 0) error(SWT.ERROR_NO_HANDLES);
int repeatBehavior = OS.RepeatBehavior_Forever();
OS.Timeline_AutoReverse(animation, true);
OS.Timeline_Duration(animation, duration);
OS.Timeline_RepeatBehavior(animation, repeatBehavior);
int keyFrames = OS.DoubleAnimationUsingKeyFrames_KeyFrames(animation);
int keyTime = OS.KeyTime_Uniform();
int keyFrame0 = OS.gcnew_DiscreteDoubleKeyFrame(0, keyTime);
int keyFrame1 = OS.gcnew_DiscreteDoubleKeyFrame(0, keyTime);
OS.DoubleKeyFrameCollection_Add(keyFrames, keyFrame0);
OS.DoubleKeyFrameCollection_Add(keyFrames, keyFrame1);
int opacityProperty = OS.UIElement_OpacityProperty();
OS.UIElement_BeginAnimation(handle, opacityProperty, animation);
int brush = OS.SystemColors_ControlTextBrush();
OS.Panel_Background(handle, brush);
imageHandle = OS.gcnew_Image();
if (imageHandle == 0) error(SWT.ERROR_NO_HANDLES);
OS.Image_Stretch(imageHandle, OS.Stretch_None);
OS.UIElement_Visibility(imageHandle, OS.Visibility_Collapsed);
int children = OS.Panel_Children(handle);
OS.UIElementCollection_Add(children, imageHandle);
OS.GCHandle_Free(children);
hide();
OS.GCHandle_Free(brush);
OS.GCHandle_Free(opacityProperty);
OS.GCHandle_Free(keyFrames);
OS.GCHandle_Free(keyTime);
OS.GCHandle_Free(keyFrame0);
OS.GCHandle_Free(keyFrame1);
OS.GCHandle_Free(animation);
OS.GCHandle_Free(duration);
OS.GCHandle_Free(timespan);
OS.GCHandle_Free(repeatBehavior);
}
