This is a known issue and is caused by the SIP changing the viewable area of the screen. The link David Gorden mentioned does help, but you actually need to change the height of the scrollviewer to achieve perfect results. To make things a little more complex WP does not trigger an event for when the SIP is visible! So you need to hook into the GotFocus/LostFocus events.
Edit your scrollviewer so it looks something like this:
<ScrollViewer x:Name="_scrollViewer"
VerticalAlignment="Top"
GotFocus="UIElement_OnGotFocus"
LostFocus="UIElement_OnLostFocus"
... bla bla
Now add the following in the codebehind:
private bool _isHdDevice;
private int _sipHeight;
private double _origHeight;
// Constructor
public MainPage()
{
InitializeComponent();
// todo - cater for landscape mode or sip scopenames that require extra space (predictive text and cut&paste icon)
var deviceWidth = this.ActualWidth;
_isHdDevice = (deviceWidth > 500);
_sipHeight = _isHdDevice ? 540 : 375;
_origHeight = _scrollViewer.Height;
}
private void UIElement_OnGotFocus(object sender, RoutedEventArgs e)
{
double height = this.ActualHeight - _sipHeight - TitlePanel.ActualHeight;
_scrollViewer.Height = height;
// the following lines are crucial otherwise a black band could appear above the SIP
App.Current.RootVisual.RenderTransform = new CompositeTransform();
this.UpdateLayout();
}
private void UIElement_OnLostFocus(object sender, RoutedEventArgs e)
{
_scrollViewer.Height = _origHeight;
}
This is basically resizing the scroll area when the sip (keyboard) is in view. You will need to add more code to cater for things like screen rotation, scopename associated to the textbox, and cut&paste icon if in view. But this will get you going and does the difficult bit.
Please mark as answered if it helped fix the issue.