Idea + Maven + component creation

Hello!
I try to add this add-on: https://vaadin.com/directory#!addon/masketfield
1) If i add maven dependency - it works good.
2) If i download sources and set it to classpath - it doesn't work.

In 1 situation i get:
- some GWT-compiled files in path '/target/classes/VAADIN/widgetsets/AppWidgetset/*.*'
- file '/target/classes/AppWidgetset.gwt.xml'
- file '/target/generated-resources/gwt/AppWidgetset.gwt.xml'
In 2 situation i get:
- files in path '/target/classes/VAADIN/widgetsets/com.alsnightsoft.vaadin.MasketfieldWidgetset/*.*'
- no '/target/classes/AppWidgetset.gwt.xml' files

Error text on component-place: 'Widgetset 'com.vaadin.DefaultWidgetSet' does not contain an implementation for com.alsnightsoft.vaadin.MaskedField. Check the connector's @Connect mapping, the widgetset's GWT module description file and re-compile your widgetset. In case you have downloaded a vaadin add-on package, you might want to refer to '

Here is Maven code with Vaadin Maven Plugin:

<plugin>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-maven-plugin</artifactId>
<version>${vaadin.plugin.version}</version>
<configuration>
<extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
<webappDirectory>${basedir}/target/classes/VAADIN/widgetsets</webappDirectory>
<draftCompile>false</draftCompile>
<compileReport>false</compileReport>
<style>OBF</style>
<!--<strict>true</strict>-->
</configuration>
<executions>
   <execution>
      <goals>
         <goal>update-theme</goal>
         <goal>update-widgetset</goal>
         <goal>compile</goal>
         <goal>compile-theme</goal>
      </goals>
   </execution>
</executions>
</plugin>

Where is the problem?
How can i use classpath-placed components instead Maven-connected?