Hello,
a lot of our users have problems to identify the active filters (look attached screenshot, this is from a real support case we got).
We use the Windows7 theme from Telerik and the active filter icon is only a little more blue than the inactive.
We have a lot suport cases where users did not recognize that they filtered the grid and claim missing/lost data.
Is it possible to colorize the active filter (red). I assume it is in the theme, but I did not find the proper key.
Can you help me?
6 Answers, 1 is accepted


Modifying the default style of the FilteringDropDown control has been documented in our Modifying Default Styles article.
For your convenience, I've modified the default ControlTemplate of the control and set a red gradient for the filtering icon. Here's the style itself:
<
Style
TargetType
=
"{x:Type telerik:FilteringDropDown}"
>
<
Setter
Property
=
"Template"
>
<
Setter.Value
>
<
ControlTemplate
TargetType
=
"{x:Type telerik:FilteringDropDown}"
>
<
Grid
>
<
Button
x:Name
=
"PART_DropDownButton"
>
<
Button.Template
>
<
ControlTemplate
TargetType
=
"{x:Type Button}"
>
<
ContentPresenter
ContentTemplate
=
"{TemplateBinding ContentTemplate}"
Content
=
"{TemplateBinding Content}"
ContentStringFormat
=
"{TemplateBinding ContentStringFormat}"
/>
</
ControlTemplate
>
</
Button.Template
>
<
Border
Background
=
"Transparent"
Cursor
=
"Hand"
Padding
=
"3,0,0,0"
>
<
Grid
Cursor
=
"Hand"
Height
=
"13"
Width
=
"12"
>
<
Path
Data
=
"M5,9L6,9 6,10 5,10z M4,4L5,4 5,5 5,6 5,7 5,8 5,9 4,9 4,8 4,7 4,6 4,5z M7.9850001,3L8.985,3 8.985,4 8,4 8,5 8,6 8,7 8,8 8,9 8,10 8,11 7.9999997,12 6.9999998,12 6.9999998,11 6,11 6,10 6.9999999,10 6.9999999,9 6.9999999,8 6.9999999,7 6.9999999,6 6.9999999,5 6.9999999,4 7.9850001,4z M3,3L4,3 4,4 3,4z M9,2L10,2 10,3 9,3z M2,2L3,2 3,3 2,3z M7.9999999,0L9,0 10,0 11,0 12,0 12,1 11,1 11,2 10,2 10,1 9,1 7.9999999,1z M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6.9999998,0 7.9999997,0 7.9999997,1 6.9999998,1 6,1 5,1 4,1 3,1 2,1 2,2 1,2 1,1 0,1z"
Fill
=
"Black"
Margin
=
"0,1,0,0"
Stretch
=
"Fill"
/>
<
Path
Data
=
"M0,0L1,0 2,0 3.0000002,0 4.0000002,0 5.0000001,0 5.9850001,0 6.0000001,0 6.9850001,0 7.9850001,0 7.9850001,1 6.9850001,1 6.0000001,1 5.9850001,1 5.0000001,1 4.0000002,1 3.0000002,1 2,1 1,1 0,1z"
Fill
=
"White"
Height
=
"1"
Margin
=
"2,1,2,0"
Stretch
=
"Fill"
VerticalAlignment
=
"Top"
/>
<
Path
Data
=
"M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6,1 5,1 4.985,1 4.985,2 4,2 4,3 4,4 4,5 4,6 4,7 4,8 3,8 3,7 2,7 2,6 2,5 2,4 2,3 2,2 1,2 1,1 0,1z"
Margin
=
"3,2,3,3"
Stretch
=
"Fill"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.945,0.101"
StartPoint
=
"0.055,0.899"
>
<
GradientStop
Color
=
"#FFB1DFFD"
Offset
=
"0.417"
/>
<
GradientStop
Color
=
"#FFE7F7FE"
Offset
=
"0.962"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
<
Path
Data
=
"M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6,1 5,1 4.985,1 4.985,2 4,2 4,3 4,4 4,5 4,6 4,7 4,8 3,8 3,7 2,7 2,6 2,5 2,4 2,3 2,2 1,2 1,1 0,1z"
Margin
=
"3,2,3,3"
Stretch
=
"Fill"
Visibility
=
"{TemplateBinding FunnelFillVisibility}"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.703,0.697"
StartPoint
=
"0.26,0.134"
>
<
GradientStop
Color
=
"#FFDF3131"
Offset
=
"0"
/>
<
GradientStop
Color
=
"#FFDF3131"
Offset
=
"1"
/>
<
GradientStop
Color
=
"#FFEC7171"
Offset
=
"0.502"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
<
Path
Data
=
"M5,9L6,9 6,10 5,10z M4,4L5,4 5,5 5,6 5,7 5,8 5,9 4,9 4,8 4,7 4,6 4,5z M7.9850001,3L8.985,3 8.985,4 8,4 8,5 8,6 8,7 8,8 8,9 8,10 8,11 7.9999997,12 6.9999998,12 6.9999998,11 6,11 6,10 6.9999999,10 6.9999999,9 6.9999999,8 6.9999999,7 6.9999999,6 6.9999999,5 6.9999999,4 7.9850001,4z M3,3L4,3 4,4 3,4z M9,2L10,2 10,3 9,3z M2,2L3,2 3,3 2,3z M7.9999999,0L9,0 10,0 11,0 12,0 12,1 11,1 11,2 10,2 10,1 9,1 7.9999999,1z M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6.9999998,0 7.9999997,0 7.9999997,1 6.9999998,1 6,1 5,1 4,1 3,1 2,1 2,2 1,2 1,1 0,1z"
Margin
=
"0,0,0,1"
Stretch
=
"Fill"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.703,0.697"
StartPoint
=
"0.26,0.134"
>
<
GradientStop
Color
=
"#FF10579F"
Offset
=
"0"
/>
<
GradientStop
Color
=
"#FF2D6FAB"
Offset
=
"1"
/>
<
GradientStop
Color
=
"#FF70A9C6"
Offset
=
"0.502"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
</
Grid
>
</
Border
>
</
Button
>
<
Popup
x:Name
=
"PART_DropDownPopup"
AllowsTransparency
=
"True"
PopupAnimation
=
"Slide"
StaysOpen
=
"True"
/>
</
Grid
>
</
ControlTemplate
>
</
Setter.Value
>
</
Setter
>
</
Style
>
Of course, you're free to modify this to your liking.
Regards,
Dilyan Traykov
Telerik by Progress

Unfortunately, this work only for Popup filter mode, and it does not work in "FilterRow" mode.
As Dominic, we also have a lot of cases where users did not recognize that they filtered the grid and claim missing/lost data.
Is it possible just to change the active color to red in "FilterRow" mode?
thanks.
In order to modify the appearance of the filtering funnel when RadGridView's FilteringMode is set to FilterRow, you need to modify the control template of the FieldFilterControl element. Here's the extracted style for the Windows 7 theme:
<
Style
TargetType
=
"{x:Type telerik:FieldFilterControl}"
BasedOn
=
"{StaticResource FieldFilterControlStyle}"
>
<
Setter
Property
=
"Template"
>
<
Setter.Value
>
<
ControlTemplate
TargetType
=
"{x:Type telerik:FieldFilterControl}"
>
<
Border
BorderBrush
=
"{TemplateBinding BorderBrush}"
BorderThickness
=
"{TemplateBinding BorderThickness}"
>
<
Grid
x:Name
=
"PART_MainGrid"
>
<
Grid.ColumnDefinitions
>
<
ColumnDefinition
Width
=
"*"
/>
<
ColumnDefinition
Width
=
"Auto"
/>
</
Grid.ColumnDefinitions
>
<
ContentControl
x:Name
=
"PART_FilterEditorContentControl"
Grid.Column
=
"0"
IsEnabled
=
"{Binding EditorIsEnabled}"
HorizontalContentAlignment
=
"Stretch"
VerticalContentAlignment
=
"Stretch"
Margin
=
"2 1 0 2"
/>
<
telerik:RadDropDownButton
x:Name
=
"PART_DropDownButton"
Grid.Column
=
"1"
KeepOpen
=
"False"
Style
=
"{StaticResource FieldFilterDropDownButtonStyle}"
DropDownIndicatorVisibility
=
"Collapsed"
>
<
Border
Cursor
=
"Hand"
Background
=
"Transparent"
Padding
=
"3 0 0 0"
>
<
Grid
Cursor
=
"Hand"
Height
=
"13"
Width
=
"12"
>
<
Path
Data
=
"M5,9L6,9 6,10 5,10z M4,4L5,4 5,5 5,6 5,7 5,8 5,9 4,9 4,8 4,7 4,6 4,5z M7.9850001,3L8.985,3 8.985,4 8,4 8,5 8,6 8,7 8,8 8,9 8,10 8,11 7.9999997,12 6.9999998,12 6.9999998,11 6,11 6,10 6.9999999,10 6.9999999,9 6.9999999,8 6.9999999,7 6.9999999,6 6.9999999,5 6.9999999,4 7.9850001,4z M3,3L4,3 4,4 3,4z M9,2L10,2 10,3 9,3z M2,2L3,2 3,3 2,3z M7.9999999,0L9,0 10,0 11,0 12,0 12,1 11,1 11,2 10,2 10,1 9,1 7.9999999,1z M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6.9999998,0 7.9999997,0 7.9999997,1 6.9999998,1 6,1 5,1 4,1 3,1 2,1 2,2 1,2 1,1 0,1z"
Fill
=
"Black"
Margin
=
"0,1,0,0"
Stretch
=
"Fill"
/>
<
Path
Data
=
"M0,0L1,0 2,0 3.0000002,0 4.0000002,0 5.0000001,0 5.9850001,0 6.0000001,0 6.9850001,0 7.9850001,0 7.9850001,1 6.9850001,1 6.0000001,1 5.9850001,1 5.0000001,1 4.0000002,1 3.0000002,1 2,1 1,1 0,1z"
Fill
=
"White"
Height
=
"1"
Margin
=
"2,1,2,0"
Stretch
=
"Fill"
VerticalAlignment
=
"Top"
/>
<
Path
Data
=
"M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6,1 5,1 4.985,1 4.985,2 4,2 4,3 4,4 4,5 4,6 4,7 4,8 3,8 3,7 2,7 2,6 2,5 2,4 2,3 2,2 1,2 1,1 0,1z"
Margin
=
"3,2,3,3"
Stretch
=
"Fill"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.945,0.101"
StartPoint
=
"0.055,0.899"
>
<
GradientStop
Color
=
"#FFB1DFFD"
Offset
=
"0.417"
/>
<
GradientStop
Color
=
"#FFE7F7FE"
Offset
=
"0.962"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
<
Path
Data
=
"M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6,1 5,1 4.985,1 4.985,2 4,2 4,3 4,4 4,5 4,6 4,7 4,8 3,8 3,7 2,7 2,6 2,5 2,4 2,3 2,2 1,2 1,1 0,1z"
Margin
=
"3,2,3,3"
Stretch
=
"Fill"
Visibility
=
"{Binding FunnelFillVisibility}"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.703,0.697"
StartPoint
=
"0.26,0.134"
>
<
GradientStop
Color
=
"#FFDF3131"
Offset
=
"0"
/>
<
GradientStop
Color
=
"#FFDF3131"
Offset
=
"1"
/>
<
GradientStop
Color
=
"#FFEC7171"
Offset
=
"0.502"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
<
Path
Data
=
"M5,9L6,9 6,10 5,10z M4,4L5,4 5,5 5,6 5,7 5,8 5,9 4,9 4,8 4,7 4,6 4,5z M7.9850001,3L8.985,3 8.985,4 8,4 8,5 8,6 8,7 8,8 8,9 8,10 8,11 7.9999997,12 6.9999998,12 6.9999998,11 6,11 6,10 6.9999999,10 6.9999999,9 6.9999999,8 6.9999999,7 6.9999999,6 6.9999999,5 6.9999999,4 7.9850001,4z M3,3L4,3 4,4 3,4z M9,2L10,2 10,3 9,3z M2,2L3,2 3,3 2,3z M7.9999999,0L9,0 10,0 11,0 12,0 12,1 11,1 11,2 10,2 10,1 9,1 7.9999999,1z M0,0L1,0 2,0 3,0 4,0 5,0 6,0 6.9999998,0 7.9999997,0 7.9999997,1 6.9999998,1 6,1 5,1 4,1 3,1 2,1 2,2 1,2 1,1 0,1z"
Margin
=
"0,0,0,1"
Stretch
=
"Fill"
>
<
Path.Fill
>
<
LinearGradientBrush
EndPoint
=
"0.703,0.697"
StartPoint
=
"0.26,0.134"
>
<
GradientStop
Color
=
"#FF10579F"
Offset
=
"0"
/>
<
GradientStop
Color
=
"#FF2D6FAB"
Offset
=
"1"
/>
<
GradientStop
Color
=
"#FF70A9C6"
Offset
=
"0.502"
/>
</
LinearGradientBrush
>
</
Path.Fill
>
</
Path
>
</
Grid
>
</
Border
>
<
telerik:RadDropDownButton.DropDownContent
>
<
ListBox
x:Name
=
"PART_FilterOperatorsListBox"
ItemsSource
=
"{Binding AvailableOperatorViewModels}"
SelectedItem
=
"{Binding SelectedOperatorViewModel, Mode=TwoWay}"
/>
</
telerik:RadDropDownButton.DropDownContent
>
</
telerik:RadDropDownButton
>
</
Grid
>
</
Border
>
</
ControlTemplate
>
</
Setter.Value
>
</
Setter
>
</
Style
>
Regards,
Dilyan Traykov
Telerik by Progress

Hello stegua,
we solved it, by changing the color of the filtericon in the Telerik theme to red.
1. Take the Teletik Theme project sources.
2. Open "Telerik.Windows.Controls.GridView.xaml"
3. Navigate to line 104.
4. Changed the Color of the GridView_FilterIconBackground_Filtered brush to red:
<
LinearGradientBrush
x:Key
=
"GridView_FilterIconBackground_Filtered"
EndPoint
=
"0.703,0.697
StartPoint
=
"0.26,0.134"
><
br
>
<
GradientStop
Color
=
"#FFFF0000"
Offset
=
"0"
/><
br
>
<
GradientStop
Color
=
"#FFFF0000"
Offset
=
"1"
/><
br
>
<
GradientStop
Color
=
"#FFFF0000"
Offset
=
"0.502"
/><
br
>
</
LinearGradientBrush
>
5. Compile the Theme project and take the compiled assembly to you Telerik reference folder.
Regards,
Dominic