apex 4 gantt chart task collapser missing - oracle

Question

I used APEX 4.2 to create a Gantt chart with the AnyGantt Library.
When i use a custom XML for the Anygantt Diagram everythign works fine. As soon as i want to use custom datagrids, the collapser is missing.
My XML is the following:
<anygantt> <settings>
<navigation enabled="True" position="Top" size="30">
</navigation>
<editing allow_edit="true">
<rounding>
<date unit="Week" step="1" />
</rounding>
</editing>
<locale>
<date_time_format week_starts_from_monday="True">
<months>
<names>January,February,March,April,May,June,July,August,September,October,November,December</names>
<short_names>Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec</short_names>
</months>
<week_days>
<names>Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday</names>
<short_names>Sun,Mon,Tue,Wed,Thu,Fri,Sat</short_names>
</week_days>
<format>
<full>%yyyy.%MM.%dd.%HH.%mm.%ss</full>
<date>%yyyy.%MM.%dd</date>
<time>%HH.%mm.%ss</time>
</format>
</date_time_format>
</locale>
</settings>
<datagrid enabled="true" width="300">
<columns>
<column attribute_name="Name" width="200" cell_align="Left">
<header>
<text>Name</text>
</header>
<format>{%Name}</format>
</column>
<column width="40" cell_align="Left">
<header>
<text>Stunden</text>
</header>
<format>{%Stunden}</format>
</column>
</columns>
</datagrid>
<styles>
<defaults>
<period>
<period_style>
<bar_style>
<labels>
<label anchor="Center" valign="Center" halign="Center">
<text>{%DISPO} %</text>
<font face="Verdana" size="10" bold="true" color="White">
</font>
</label>
</labels>
</bar_style>
</period_style>
</period>
</defaults>
<period_styles>
<period_style name="test">
<bar_style>
<labels>
<label anchor="Center" valign="Center" halign="Center">
<text>Center</text>
<font face="Verdana" size="10" bold="true" color="White">
</font>
</label>
</labels>
<middle shape="Full">
<fill enabled="true" type="Solid" color="DarkSeaGreen" />
<border enabled="true" color="#FF0000" />
</middle>
</bar_style>
</period_style>
</period_styles>
</styles>
<resource_chart><resources><resource name="AVI" id="5"/>
<resource name="CAB" id="4"/>
<resource name="Test, Test (Test)" id="3-U837751" parent="3"/>
<resource name="PL" id="3"/>
<resource name="Struktur" id="2"/>
</resources><periods><period resource_id="3-U837751" name="NAME-3-U837751" start="2015.07.28 00:00" end="2015.07.31 00:00">
<attributes>
<attribute name="DISPO"><![CDATA[,5]]></attribute>
</attributes>
</period></periods></resource_chart>

Answer 1

You need to add cell_align="LeftLevelPadding" to the column where you want to see the collapser. Something like:
<column attribute_name="Name" width="200" cell_align="LeftLevelPadding">
This is described in KB: http://support.anychart.com/customer/portal/articles/2077851--anygantt-4-x-collapser-is-missing-in-datagrid-column
You can find more info on columns at
http://6.anychart.com/products/anygantt/docs/users-guide/index.html?columns.html