Add support for doughnut charts

Available in R3 2018 release. For more info on the donut series refer to: https://docs.telerik.com/devtools/xamarin/controls/chart/series/pie/donut-series

The purpose of this item is to track demand for support of the GTK platform in the Telerik Xamarin controls. 

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/platform/gtk?tabs=vswin

https://docs.microsoft.com/en-us/xamarin/xamarin-forms/platform/
Xamarin Forms is growing! Does your controls-set plans to grow with it??

I'm currently working on a new project, and had to drop the usage of telerik's products, because its lack of support to other platforms.

What are your plans on this subject?

It would be great if we could have support to (but not limited to): Android, IOS, UWP (Mobile and Desktop "win10"), WPF (For Desktop Applications on win7,8,10), GTK# (Linux) and macOS.

I'm sure I wouldn't be the only one to buy your products if you upgrade yours platforms support.

Thanks!

SlidedToIndex event is triggered from a non-UI thread which forces the users to use Device.BeginInvokeOnMainThread

Currently, the project template generates a PCL that uses an App.cs.

Most developers who use XAML prefer to have an App.xaml in order to use global resources (or the Telerik Theming mechanism).

Please consider adding a checkbox to the Project Wizard that lets you choose between using [App.xaml/App.xaml.cs] or [App.cs]

It would be very helpfull to have some demo projects showing how to use UI for Xamarin in XAML

Available in the 2018 R2 SP release.

Available in the 2018 R2 SP release.

If you have set MaxDate in the Calendar and you swipe the view to see the previous month, it is not possible to navigate back to the month that has the MaxDate. If you change the month through the MonthView -> everything starts working.

Available in the 2018 R2 SP release.

Multiple selected items that were selected become unselected when being filtered out.

Steps to reproduce:

1 - Select multiple items
2 - Apply filter where some or all of the selected items are filtered out
3 - Remove filter

Observe: 

1 - The items that were previously selected have lost their selection state after returning
2 - Items that were not filtered, or selected while filter was active, retain selection state

AddEditorForProperty method is not respected, the default editor is used instead. 

As a workaround, please use SetEditorProvider method  (https://docs.telerik.com/devtools/xamarin/nativecontrols/android/dataform/dataform-features) in order to create custom editors.

Add gesture support to DataGrid, similar to the gestures found in RadListView (reorder, tap and hold, item swipe, pull to refresh, etc).

TreeView control similar to the UI for WPF suite.

Available in R2 2018 release. More information can be found here: https://docs.telerik.com/devtools/xamarin/controls/treeview/treeview-overview

Mapping of editor between JSON Schema and DataForm Editor:

DataFormAutoCompleteEditor:  autocomplete
DataFormBooleanEditor:   N/A
DataFormCheckBoxEditor:   checkbox
DataFormCustomEditor:   n/a
DataFormDateEditor:    datepicker
DataFormDateTimeEditor:   n/a
DataFormTimeEditor:    timepicker
DataFormDecimalEditor:   decimal
DataFormEmailEditor:   email
DataFormIntegerEditor:   integer
DataFormListViewEditor:   list
DataFormMultilineTextEditor: n/a
DataFormNumberPickerEditor:  numberpicker
DataFormPasswordEditor:   password
DataFormPhoneEditor:   phone
DataFormRadAutoCompleteEditor: n/a
DataFormRadioGroupEditor:  radio
DataFormSeekBarEditor:   seekbar
DataFormSegmentedEditor:  segmentededitor
DataFormSpinnerEditor:   picker
DataFormSwitchEditor:   switch
DataFormToggleButtonEditor:  n/a
DataFormTextEditor:    text