I am using a WPF tab control to present separate repeated instances of a user control. i.e. Tab1 for Item1 settings, Tab2 for Item2 settings, and so on.
It appears that the radio button group names are being shared between tabs. What is going on?
Simple example:
A window contains tabs. Each tab contains a user control.
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:lib="clr-namespace:WpfApplication1"
Title="Window1" Height="300" Width="300">
<Grid>
<TabControl Margin="0,0,0,100" Name="tabControl1">
<TabItem Header="tabItem1" Name="tabItem1">
<lib:UserControl1 x:Name="userControlInTab1" />
</TabItem>
<TabItem Header="tabItem2" Name="tabItem2">
<lib:UserControl1 x:Name="userControlInTab2" />
</TabItem>
</TabControl>
</Grid>
The user control is simply two radiobuttons in a group:
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="50" Width="100">
<StackPanel>
<RadioButton GroupName="Group1" Name="radiobutton1" Content="option1" IsChecked="True" />
<RadioButton GroupName="Group1" Name="radiobutton2" Content="option2" />
</StackPanel>
If you run this app, you will see that only the radiobutton1 in the second tab is checked, despite the usercontrol defining it to always be checked at startup.
Further, setting a radiobutton as checked in code behind seems to uncheck all the radiobuttons in other tabs!
It seems like things behave fine under mouse control (i.e. tabs are independent).
Lastly, the usercontrols do seem to be separate instantiations. I have tried this with sliders on user controls, for example, and they do behave independently across tabs. As they should.
Thanks for anyone's help with this. I have searched widely to no avail. Surely I'm not the only person who has had this issue. I'm using VS2008.
Use the GroupName property to specify a grouping of radio buttons to create a mutually exclusive set of controls. You can use the GroupName property when only one selection is possible from a list of available options. When this property is set, only one RadioButton in the specified group can be selected at a time.
You group RadioButton controls by putting them inside the same parent container or by setting the GroupName property on each RadioButton to the same value. A RadioButton has two states: selected or cleared.
You group radio buttons by drawing them inside a container such as a Panel control, a GroupBox control, or a form. All radio buttons that are added directly to a form become one group. To add separate groups, you must place them inside panels or group boxes.
A Radio Button is a control that allows a user to select a single option from a group of options. The user is limited to select a single option from a related list of options which are mutually exclusive. It has only two options − Selected.
This behaviour is by design:
the whole point of GroupName is to allow you to define radio buttons that act as a group without having to be contained by the same parent panel.
Please read this article for detailed explanation.
To speak briefly, there are two solutions for two different cases:
If you have all logically related radio buttons in one container, then don't specify a GroupName. In this case radio buttons will automatically form a group that's independent of any other radio button groups.
If you split logically related radio buttons across multiple panels for layout purposes, then read the article for a lengthy explanation what to do.
Without the GroupName set it works. It is not strictly necessary since the RadioButtons in one container are automatically grouped anyway. For example:
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Height="50" Width="100">
<StackPanel>
<StackPanel>
<RadioButton Name="radiobutton1" Content="option1" IsChecked="True" />
<RadioButton Name="radiobutton2" Content="option2" />
</StackPanel>
<StackPanel>
<RadioButton Name="radiobutton3" Content="option3" IsChecked="True" />
<RadioButton Name="radiobutton4" Content="option4" />
</StackPanel>
</StackPanel>
</UserControl>
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