c# - Set IsEnabled Property of ComboBox Based on SelectedItem -

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i want enable/disable combobox based on if there item selected in combobox. able working setting trigger on style, overrides custom global style combobox. there way same functionality without losing style?

<combobox grid.column="1" grid.row="1"               name="analysiscombobox"                minwidth="200"               verticalalignment="center" horizontalalignment="left"               itemssource="{binding path=availableanalysis}">          <combobox.style>             <style targettype="{x:type combobox}">                 <setter property="isenabled" value="true" />                 <style.triggers>                     <datatrigger binding="{binding selecteditem,elementname=applicationcombobox}" value="{x:null}">                         <setter property="isenabled" value="false" />                     </datatrigger>                 </style.triggers>             </style>         </combobox.style>     </combobox>

you don't need via style, can bind isenabled property directly using value converter follows:

<combobox grid.column="1" grid.row="1"               name="analysiscombobox"                minwidth="200"               verticalalignment="center" horizontalalignment="left"               isenabled={binding selecteditem, elementname=applicationcombobox, converter={staticresource nulltofalseconverter}}"               itemssource="{binding path=availableanalysis}"/>

where nulltofalseconverter key instance of followsing converter:

public class nulltofalseconverter: ivalueconverter {     public object convert(object value, type targettype, object parameter, system.globalization.cultureinfo culture)     {         return value == null;     }      public object convertback(object value, type targettype,       object parameter, system.globalization.cultureinfo culture)     {         throw new notimplementedexception();     } }

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