support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Data/ResourceToken.tt

@@ -0,0 +1,63 @@
+<#@ template debug="false" hostspecific="false" language="C#" #>
+<#@ import namespace="System.Collections.Generic"#>
+<#@ output extension=".cs" #>
+<#
+var geometryList = new List<string>
+{
+	"SuccessGeometry",
+	"InfoGeometry",
+	"ErrorGeometry",
+	"WarningGeometry",
+	"AskGeometry",
+	"FatalGeometry",
+	"PrimaryBrush"
+};
+var brushList = new List<string>
+{
+	"SuccessBrush",
+	"InfoBrush",
+	"DangerBrush",
+	"WarningBrush",
+	"AccentBrush",
+	"PrimaryTextBrush",
+	"ThirdlyTextBrush",
+	"BlurGradientValue"
+};
+var styleList = new List<string>
+{
+	"ButtonCustom",
+	"PaginationButtonStyle",
+	"WindowWin10",
+	"AddTagButtonStyle",
+	"RadioGroupItemDefault",
+	"RadioGroupItemSingle",
+	"RadioGroupItemHorizontalFirst",
+	"RadioGroupItemHorizontalLast",
+	"RadioGroupItemVerticalFirst",
+	"RadioGroupItemVerticalLast",
+	"TabItemCapsuleDefault",
+	"TabItemCapsuleSingle",
+	"TabItemCapsuleHorizontalFirst",
+	"TabItemCapsuleHorizontalLast",
+	"TabItemCapsuleVerticalFirst",
+	"TabItemCapsuleVerticalLast"
+};
+#>
+namespace HandyControl.Data
+{
+	internal class ResourceToken
+    {
+    <#foreach(var item in geometryList){#>
+    public static readonly string <#=item#> = nameof(<#=item#>);
+
+    <#}#>
+<#foreach(var item in brushList){#>
+    public static readonly string <#=item#> = nameof(<#=item#>);
+
+    <#}#>
+<#foreach(var item in styleList){#>
+    public static readonly string <#=item#> = nameof(<#=item#>);
+
+    <#}#>
+}
+}