B4J Question view exceeds / overlap container border

Sub Process_Globals
        Private fx As JFX
        Private frm As Form
        Private pane1 As Pane
        Private lbl As Label
End Sub

Sub AppStart (Form1 As Form, Args() As String)
        frm.Initialize("frm",600,600)
        pane1.Initialize("pane1")
        pane1.Style="-fx-background-color: yellow;"
        frm.RootPane.AddNode(pane1,150,150,300,300)
        lbl.Initialize("lbl")
        lbl.Style="-fx-background-color: cyan;"
        pane1.AddNode(lbl,-150,0,300,20)
        frm.Show
End Sub