Update Slate_API.md

Roberto De Ioris · web-flow · commit 0c185def0e59 · 2018-09-07T10:25:29.000+02:00
diff --git a/docs/Slate_API.md b/docs/Slate_API.md
@@ -344,4 +344,12 @@ window.set_content(SBorder()(horizontal_box))
 
 You can obviously combine vertical and horizontal boxes (this time using 'visual' style)
 
+## SGridPanel
+
+## SScrollBox
+
 ## SButton
+
+## SEditableTextBox
+
+## SImage
