BrowsableAttributes

I was successful adding a new subclass of DataFilter:

/// <summary>
/// Filters properties having certain Attribute types in a manner simular to .BrowsableAttributes, but with the extra capabilities of a DataFilter
/// (We use this to limit settings that are for developers and advanced users)
/// </summary>
public class PropertyAttributeFilter : PropertyBooleanFilter
{

/// <summary>
/// Attribute Type to filter out
/// </summary>
public Type AttributeType { get; set; }

/// <summary>
/// This allows inverted control of IsEnabled
/// </summary>
public bool IsDisabled
{
get { return !IsEnabled; }
set { IsEnabled = !value; }
}

/// <summary>
/// Filters out properties having an attribute of type AttributeType (if the filter IsEnabled)
/// </summary>
/// <param name="dataAccessor"></param>
/// <returns>filter = false tells property grid not to filter out this property, e.g. to show the property</returns>
public override bool Filter(IDataAccessor dataAccessor)
{
PropertyDescriptorDataAccessor pdda = dataAccessor as PropertyDescriptorDataAccessor;
CategoryDataAccessor cda = dataAccessor as CategoryDataAccessor;
if (pdda != null)
{
PropertyDescriptor pd = pdda.PropertyDescriptor;
Attribute attr = (Attribute)pd.Attributes[AttributeType];
if (attr != null && attr.GetType() == AttributeType)
return IsEnabled;
else
return false;
}
else if (dataAccessor is CategoryDataAccessor)
return false; //category doesn't matter
else
return base.Filter(dataAccessor);
}
}

So now I can use xaml to combine with other DataFilters:

<propgrid:DataFilterGroup x:Name="groupFilter" Operation="And">
<propgrid:PropertyStringFilter x:Name="stringFilter" Operation="Contains" Value="{Binding Path=Text, ElementName=searchText}" StringComparison="CurrentCultureIgnoreCase" />
<local:PropertyAttributeFilter x:Name="advFilter" AttributeType="local:AdvancedUsersAttribute" />
<local:PropertyAttributeFilter x:Name="devFilter" AttributeType="local:DeveloperAttribute" />
</propgrid:DataFilterGroup>

Works for me! You are welcome to include this in the next release.