Explicitly setting the Text property of the RadEntry to null results in NullReferenceException. This is not the behavior with the standard Entry control.

On Android, when binding the Text value to a view model property, the value doesn't update.

Use the following to reproduce:

// VIEW

<Label Text="RadEntry" />
<telerikInput:RadEntry x:Name="MyRadEntry" 
                       Text="{Binding Username}" 
                       Margin="0,0,0,20"/>
        
<Label Text="Xamarin.Forms Entry" />
<Entry Text="{Binding Username}"/>

// VIEW MODEL

public class ViewModel : NotifyPropertyChangedBase
{
    private string username = "initial";
    private int counter;

    public ViewModel()
    {
        Device.StartTimer(TimeSpan.FromMilliseconds(500), (() =>
        {
            counter++;
                
            Device.BeginInvokeOnMainThread(() =>
            {
                Username = $"{counter}";
            });
                
            return counter < 100;
        }));
    }

    public string Username
    {
        get { return username; }
        set { username = value; OnPropertyChanged();}
    }
}


 Update: Available in R1 2018 SP release.

As a workaround you could set TextColor property of the Entry control.

Available in minor release 2018.3.1122. It will also be available in the R1 2019 release.

In Android the OneWay binding to Text property is not working

IsFocused doesn't appear to work when it's bound to a property in an item template.

Available in minor release 2018.2.821. It will also be available in the R3 2018 release.

Any version of Xamarin.Forms, the iOS version of the application crashes when attempting to apply a custom font "parameter descriptor cannot  be null"  

With this resource defined, and the OpenSans-Bold.ttf is in the Resources directory, marked as bundle resource...

<OnPlatform x:TypeArguments="x:String" x:Key="BoldFont">
    <On Platform="Android" Value="OpenSans-Bold.ttf#Open Sans" />
    <On Platform="iOS" Value="OpenSans-Bold" />
 </OnPlatform>

And using this code for the style (created from the Telerik login view template, with some modifications):

    <Style x:Key="LoginEntryStyle"
           TargetType="telerikInput:RadEntry">
        <Setter Property="TextColor"
                Value="{StaticResource DarkTextColor}" />
        <Setter Property="WatermarkTextColor"
                Value="{StaticResource LightBlueColor}" />
        <Setter Property="FontSize"
                Value="14" />
        <Setter Property="FontFamily"
                Value="{StaticResource BoldFont}" />
        <Setter Property="HeightRequest"
                Value="48" />
        <Setter Property="Margin"
                Value="0,0,0,16" />
        <Setter Property="BorderStyle">
            <Setter.Value>
                <telerikInput:BorderStyle BorderColor="{StaticResource LightBlueColor}"
                                          BorderThickness="1"
                                          CornerRadius="8" />
            </Setter.Value>
        </Setter>
    </Style>

When BorderColor is applied, it is still changed to the default one when the end user hovers over or focuses the control

All entry fields are not aligned to Right when the RTL language is selected.