Use middle click to pull/push the pull-to-scan middle knob

Aircraft/Instruments/kln89.xml

@@ -45,6 +45,32 @@ properties' values.
    <w>908</w>
    <h>273</h>
   </layer>
+  
+ <layer>
+   <name>scan-pull</name>
+   <condition>
+    <property>/instrumentation/kln89/scan-pull</property>
+   </condition>
+   <texture>
+    <path>Aircraft/Instruments/Textures/kln89.rgb</path>
+    <x1>0.005</x1>
+    <x2>0.1230</x2>
+    <y1>0.1953</y1>
+    <y2>0.4219</y2>
+   </texture>
+   <transformations>
+    <transformation>
+     <type>x-shift</type>
+     <offset>375</offset>
+    </transformation>
+    <transformation>
+     <type>y-shift</type>
+     <offset>-60</offset>
+    </transformation>
+   </transformations>
+   <w>117</w>
+   <h>112</h>
+  </layer>
 
  </layers>
 
@@ -195,7 +221,20 @@ properties' values.
     <command>kln89_knob2left1</command>
    </binding>
   </action>
+  
+  <action>
+   <name>Inner Knob Toggle Scan</name>
+   <button>1</button>
+   <x>340</x>
+   <y>-110</y>
+   <w>90</w>
+   <h>90</h>
+   <binding>
+    <command>property-toggle</command>
+    <property>/instrumentation/kln89/scan-pull</property>
+   </binding>
+  </action>
 
  </actions>
 
-</PropertyList>
+</PropertyList>

preferences.xml

@@ -742,6 +742,10 @@ Started September 2000 by David Megginson, david@megginson.com
    <approach-active type="bool">false</approach-active>
    <cdi-deflection type="double">0</cdi-deflection>
   </gps>
+  
+  <kln89>
+   <scan-pull type="bool" archive="y">false</scan-pull>
+  </kln89>
 
   <clock>
    <serviceable type="bool" archive="y">true</serviceable>