scroll - win phone scrolling ListBox not working -

When the two grids are one after the other in the phone and each has its own list, the box scroll is not working is. any idea?

  & lt; Grid X: Name = "Layouts" background = "Transparent" & gt; & Lt; Grid.RowDefinitions & gt; & Lt; RowDefinition Height = "Auto" /> & Lt; Roadfinion height = "*" /> & Lt; /Grid.RowDefinitions> & Lt ;! - ContentPanel - Extra content here Place - & gt; & Lt; Grid X: Name = "ContentPanel 1" grid. Rau = "1" margin = "12,0,12,0" & gt; & Lt; ListBox x: name = "lstData1" item source: "{binding source = {static resource generation}, path = dataclassation}" & gt; & Lt; ListBox.ItemTemplate & gt; & Lt; DataTemplate & gt; ................. & lt; / DataTemplate & gt; & Lt; /ListBox.ItemTemplate> & Lt; / ListBox & gt; & Lt; / Grid & gt; & Lt; Grid X: Name = "Content Page 2" Grid. Line = "2" margin = "12,0,12,0" & gt; & Lt; ListBox x: name = "lstData2" item source = "{binding source = {static processing software productivity}, path = dataclassation}" & gt; & Lt; ListBox.ItemTemplate & gt; & Lt; DataTemplate & gt; .................. & lt; / DataTemplate & gt; & Lt; /ListBox.ItemTemplate> & Lt; / ListBox & gt; & Lt; / Grid & gt; & Lt; / Grid & gt;  

Thank you best

should be specified for height Scroll to work