EntityCombinedScreen adding upload button

Hello
When i add button on EntityCombinedScreen , i can’t edit entity on this page
How can i solve this task?
Any solitions, why this not work.
Version 6.9.2
Platform v.6.9.3
cuba

Hi
could you please share the XML file of the screen with us?

Yes, of cource

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<window xmlns="http://schemas.haulmont.com/cuba/window.xsd"
        caption="msg://tracker"
        class="com.company.scrumit.web.tracker.Trackerlist"
        messagesPack="com.company.scrumit.web.tracker">
    <dsContext>
        <datasource id="trackerDs"
                    class="com.company.scrumit.entity.Tracker"
                    view="tracker-view"/>
        <hierarchicalDatasource id="trackersDs"
                                class="com.company.scrumit.entity.Tracker"
                                hierarchyProperty="tracker"
                                view="tracker-tree">
            <query>
                <![CDATA[select e from scrumit$Tracker e]]>
            </query>
        </hierarchicalDatasource>
    </dsContext>
    <actions>
        <action id="save"
                caption="mainMsg://actions.Ok"
                icon="icons/ok.png"
                invoke="save"
                shortcut="CTRL-ENTER"/>
        <action id="cancel"
                caption="mainMsg://actions.Cancel"
                description="Esc"
                icon="icons/cancel.png"
                invoke="cancel"/>
    </actions>
    <dialogMode height="600"
                width="800"/>
    <layout>
        <split height="100%"
               orientation="horizontal"
               reversePosition="true"
               width="100%">
            <vbox id="lookupBox"
                  expand="table"
                  height="100%"
                  margin="false,true,false,false"
                  spacing="true">
                <filter id="filter"
                        applyTo="table"
                        datasource="trackersDs">
                    <properties include=".*"/>
                </filter>
                <treeTable id="table"
                           multiselect="true"
                           width="100%">
                    <actions>
                        <action id="create"/>
                        <action id="edit"/>
                        <action id="remove"/>
                        <action id="refresh"/>
                        <action id="upload"/>
                    </actions>
                    <columns>
                        <column id="shortdesc"/>
                        <column id="type"/>
                        <column id="description"/>
                    </columns>
                    <rows datasource="trackersDs"/>
                    <rowsCount/>
                    <buttonsPanel id="buttonsPanel"
                                  alwaysVisible="true">
                        <button id="createBtn"
                                action="table.create"/>
                        <button id="editBtn"
                                action="table.edit"/>
                        <button id="removeBtn"
                                action="table.remove"/>
                        <button id="refreshBtn"
                                action="table.refresh"/>
                    </buttonsPanel>
                </treeTable>
            </vbox>
            <vbox id="editBox"
                  expand="description"
                  height="100%"
                  margin="false,false,false,true"
                  spacing="true">
                <fieldGroup id="fieldGroup"
                            datasource="trackerDs">
                    <column width="300px">
                        <field caption="mainMsg://Parent"
                               property="task"/>
                        <field property="shortdesc"/>
                        <field property="type"/>
                    </column>
                </fieldGroup>
                <upload id="uploadField"/>
                <richTextArea id="description"
                              datasource="trackerDs"
                              property="description"
                              width="100%"/>
                <scrollBox/>
                <hbox id="actionsPane"
                      spacing="true"
                      visible="false">
                    <button id="saveBtn"
                            action="save"/>
                    <button id="cancelBtn"
                            action="cancel"/>
                </hbox>
            </vbox>
        </split>
    </layout>
</window>

It seems, that you have unused scroll box component on your screen. Please, check that you really need it, because it may cause your issue.