sorry by that 
Here the "init.tcl" file:
plugin_addpath /Users/test/.nuke/gizmos
and here the "menu.tcl":
menu "Other/test_01" test_01.gizmo
and here the "test_01.gizmo" file (a simple blur + EXPtool node):
#! /Applications/D2Software/Nuke4.5.14.app/Contents/MacOS/../../nuke4.5_ -nx
version 4.5014
Gizmo {
inputs 1
name test_01
}
Input {
inputs 0
name Input1
xpos -67
ypos -34
}
Blur {
name Blur1
xpos -67
ypos -8
}
EXPTool {
name EXPTool1
xpos -67
ypos 32
}
Output {
name Output1
selected true
xpos -67
ypos 58
}
end_group
Thanks a lot for any help!