I have this style from my XAMTEXTEDITORS

    <Style TargetType="{x:Type igEditors:XamTextEditor}" >
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
        <Setter Property="BorderBrush" Value="Black" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Padding" Value="2,2,2,2" />
        <Setter Property="Margin" Value="{DynamicResource {x:Static igEditors:EditorsBrushKeys.TextEditorMarginKey}}" />
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type igEditors:XamTextEditor}">
                    <Border x:Name="MainBorder"
                                CornerRadius="1"
         Background="{TemplateBinding Background}"
         BorderBrush="{TemplateBinding BorderBrush}"
         BorderThickness="{TemplateBinding BorderThickness}"
         SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"
       >
                        <TextBlock x:Name="TextBlock"
       Margin="{TemplateBinding Padding}"
       Text="{TemplateBinding DisplayText}"
       TextWrapping="{TemplateBinding TextWrapping}"
       HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
       VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
       TextAlignment="{TemplateBinding TextAlignmentResolved}"
        />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="EditTemplate">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type igEditors:XamTextEditor}">
                    <Border
      x:Name="MainBorder"
      Background="{TemplateBinding Background}"
      BorderBrush="{TemplateBinding BorderBrush}"
      BorderThickness="{TemplateBinding BorderThickness}" 
                                                            CornerRadius="5">

                        <TextBox
       Name="PART_FocusSite"
       Padding="{TemplateBinding Padding}"
       Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Text, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
       TextWrapping="{TemplateBinding TextWrapping}"
       HorizontalScrollBarVisibility="{TemplateBinding HorizontalScrollBarVisibility}"
       VerticalScrollBarVisibility="{TemplateBinding VerticalScrollBarVisibility}"
       HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
       VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
       TextAlignment="{TemplateBinding TextAlignmentResolved}"
                            MaxLength="{Binding Path=ValueConstraint.MaxLength, Mode=TwoWay}"                           
       IsReadOnly="{TemplateBinding ReadOnly}"
       Background="Transparent"
       BorderBrush="Transparent"
       BorderThickness="0,0,0,0"        
       Foreground="{TemplateBinding Foreground}"
       ContextMenu="{TemplateBinding ContextMenu}"
                            SpellCheck.IsEnabled="{TemplateBinding SpellCheck.IsEnabled}"
                            SpellCheck.SpellingReform="{TemplateBinding SpellCheck.SpellingReform}"
       />
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsInEditMode" Value="True">
                            <Setter Property="IsTabStop" Value="False" />
                            <Setter Property="Padding" Value="0,2,2,2"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsEmbedded" Value="True"/>
                    <Condition Property="IsInEditMode" Value="False"/>
                </MultiTrigger.Conditions>
                <Setter Property="Background" Value="{x:Null}"/>
                <Setter Property="BorderBrush" Value="{x:Null}"/>
                <Setter Property="Padding" Value="2,2,2,2"/>
            </MultiTrigger>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.InactiveBorderBrushKey}}"/>
                <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
            </Trigger>
        </Style.Triggers>
    </Style>

My problem is that I want change the editor maxlength at runtime because I have this data at runtime form Database.

I have tried with this code

vc.MaxLength = 25 (Data form Database)

Dim setter4 As New Setter(XamTextEditor.ValueConstraintProperty, vc)

XamDGFormasPago.Records.FieldLayout.Fields(

"COD").Settings.EditorType = GetType(XamTextEditor)

st3.TargetType =

GetType(XamTextEditor)

st3.Setters.Add(setter4)

"COD").Settings.EditorStyle = st3

The problem is that my text editor maxlength is 25 but the editor doesn`t have rounded borders.

Can yo explain me how can I do it.