completed extend-controls docs

doc/source/handycontrol/extend_controls/toggleBlock/index.md

@@ -0,0 +1,31 @@
+---
+title: ToggleBlock 切换块
+---
+
+该控件可根据选中状态切换显示内容，在某些情况下可以代替 `ToggleButton`.
+
+```cs
+public class ToggleBlock : Control
+```
+
+# 属性
+
+|属性|描述|默认值|备注|
+|-|-|-|-|
+|IsChecked|是否选中|false||
+|CheckedContent|选中时显示的内容|||
+|UnCheckedContent|未选中时显示的内容|||
+|IndeterminateContent|选中状态未知时显示的内容||||
+
+# 案例
+
+```xml
+<hc:ToggleBlock>
+    <hc:ToggleBlock.UnCheckedContent>
+        
+    </hc:ToggleBlock.UnCheckedContent>
+    <hc:ToggleBlock.CheckedContent>
+
+    </hc:ToggleBlock.CheckedContent>
+</hc:ToggleBlock>
+```