can't move image to the desired crop area

[kubaizi]

i set the ImageCropView size to be 16:9

width = screenWidth height =screenWidth*(16/9)

but i cant move the image up. the image is not freely moving inside the cropping area.

thanks in advanced.

<imgcrop:ImageCropView Grid.Row="0" HeightRequest="{Binding ImageHeight}" WidthRequest="{Binding ImageWidth}" x:Name="cropView" Source="{Binding SourceImage}" Aspect="AspectFill" > <imgcrop:ImageCropView.PreviewTransformations> <fftransformations:CropTransformation /> </imgcrop:ImageCropView.PreviewTransformations> </imgcrop:ImageCropView>

[kubaizi]

solved!! i just have to set CropHeightRatio,CropWidthRatio in CropTransformation