The App bar background color is gray, and the search bar doesn't look good with this black textcolor and dark gray background color.
The default SearchBar look on iOS:
Currently, It's quite difficult to detect whether the text has been changed after the control is loaded completely.
And TextFormattingChanged event can not be raised when the text content is changed while text format isn't.
My mobile app requires that my data grid have frozen columns on the left that do NOT scroll horizontally. This is useful when the first column might be an ID column or a Date column that the user always needs to see when scrolling through the other data columns.
Like in the WPF GridView control:
Introducing a TabItem.IsTabVisible property would be useful. Currently, if you want to hide a tab, you need to remove it from the TabView.Items collection and cache it in a backing collection. Then, to re-show the tab, remove it from the cache and add it back to the TabItems (preferably at the same index if you've also cached it's position).