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Are you using CustomLookup in your MXML 
 
Can be two problems: 
1) parentDocument is not instance of CustomLookup 
add one line above trace(parentDocument ); 
2) in CustomLookup.as file you don't have public function parseSearchText 
you can validate by: 
var lookup: CustomLookup= this.parentDocument as CustomLookup; 
trace(lookup.hasOwnProperty(&quot;parseSearchText&quot;)); 
 

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actually i am getting an error &nbsp; 
on this line 
var searchString : String = (this.parentDocument as CustomLookup).parseSearchText(); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
 
The error is 
TypeError: Error #1009: Cannot access a property or method of a null object reference.
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Did you read what I am suggestion? 
 
replace by 
 
trace(&quot;Is CustomLookup=&quot; + this.parentDocument is CustomLookup); 
var lookup: CustomLookup= this.parentDocument as CustomLookup; 
trace(&quot;Is accessible to parseSearchText=&quot;+lookup.hasOwnProperty(&quot;parseSearchText&quot;)); 
var searchString : String = lookup.parseSearchText(); 
 

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Hi i tried this and getting this responce in console 
 
trace(&quot;Is CustomLookup=&quot; + this.parentDocument is CustomLookup); 
false 
 
var lookup: CustomLookup= this.parentDocument as CustomLookup; 
trace(&quot;Is accessible to parseSearchText=&quot;+lookup.hasOwnProperty(&quot;parseSearchText&quot;)); 
getting error here: TypeError: Error #1009: Cannot access a property or method of a null object reference. 
 
var searchString : String = lookup.parseSearchText(); 
 
thanks
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You got answer in first trace. You are customhouse to wrong class. Check what type of parentDocument
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yeah.Actually this is what i am doing 
 
In CustomLookup.as i am using this code 
/** 
&nbsp;* Prepares the datagrid column from dataFieldCollection. 
&nbsp;* */ 
public function createDataGridColumns () : void { 
columns = new Array(); 
for each (var object : Object in dataFieldCollection){ 
var col : DataGridColumn = new DataGridColumn(); 
col.headerText = object.headerText; 
col.dataField = object.dataField; 
col.width = object.width; 
if ( object.dataField != CHECKHBOX ) { 
col.itemRenderer = new ClassFactory ( org.ms.views.components.renderers.DataLabelForGrid ); 
} else { 
col.itemRenderer = new ClassFactory ( org.ms.views.components.renderers.SelectCheckBox ); 
} 
columns.push( col ); 
} 
dataGrid.columns = columns; 
} 
 
 
 
and in DataLabelForGrid.mxml &nbsp;i have 
 
&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt; 
&lt;mx:Label xmlns:mx=&quot;<a href="http://www.adobe.com/2006/mxml" rel="ugc">http://www.adobe.com/2006/mxml</a>&quot;&gt; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
&lt;mx:Script&gt; 
&lt;![CDATA[ 
import mx.controls.dataGridClasses.DataGridListData; 
import mx.core.Application; 
import org.ms.views.components.CustomLookup; 
override public function set data ( value : Object ) : void { 
super.data = value; 
var strData : String = value as String; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
var labelString : String = value[DataGridListData(listData).dataField] as String; 
trace(&quot;parent doc=&quot; + this.parentDocument); &nbsp; 
//here i want this.parentDocument to &nbsp;be CustomLookup 
Any idea how i can make this.parentDocument as CustomLookup ? 
if (searchString.text = &quot;jay&quot;) { 
this.setStyle( &quot;color&quot;, &quot;yellow&quot; ); 
} &nbsp; 
} 
]]&gt; 
&lt;/mx:Script&gt; 
&lt;/mx:Label&gt;
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In DataLabelForGrid.mxml create public variable 
 
public var lookup:CustomLookup; 
 
Now modify you CustomLookup.as 
 
if ( object.dataField != CHECKHBOX ) { 
var cf:ClassFactory = new ClassFactory ( org.ms.views.components.renderers.DataLabelForGrid ); 
cf.properties = {lookup:this}; 
col.itemRenderer = cf; 
} else { 
 
 
That should assign lookup variable during constractor 
 
now you can use &nbsp;&quot;lookup&quot; variable &nbsp;in your DataLabelForGrid.mxml 
 
I didn't compile but should work 
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nice, but i did not understand how it works :) 
cf.properties = {lookup:this}; &nbsp;what does this line do ? 
 
&gt;&gt;That should assign lookup variable during constractor 
so lookup is assigned to CustomLookup in constructor of CustomLookup ? 
 
thanks 

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<div class="content wysiwyg-content">
hi guys 
 
I have a line like this 
var searchString : String = (this.parentDocument as TradeLookUp).parseSearchText(); 
 
TradeLookUp is mxml file. 
 
I have an actionscript file CustomLookup 
 
but when i give 
var searchString : String = (this.parentDocument as CustomLookup).parseSearchText(); 
i get an error. 
i guess this.parentDocument &nbsp;works with mxml 
any idea whats the solution 
 
thanks 
 

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</div>

hi guys

I have a line like this
var searchString : String = (this.parentDocument as TradeLookUp).parseSearchText();

TradeLookUp is mxml file.

I have an actionscript file CustomLookup

but when i give 
var searchString : String = (this.parentDocument as CustomLookup).parseSearchText();
i get an error.
i guess this.parentDocument  works with mxml 
any idea whats the solution

thanks



this.parentDocument  for actionscript file

Apache Flex is a highly productive, open source application framework for building and maintaining expressive web applications that deploy consistently on all major browsers, desktops and devices (including smartphones, tablets and television). It provides a modern, standards-based language and programming model that supports common design patterns suitable for developers from many backgrounds. Flex applications can be deployed to the Adobe Player in the browser, Adobe AIR on desktop and mobile devices or to native Android, iOS, Windows or Mac applications.