В основном работает

DB_IaT/InstructorsAndTrainees/instructorsandtraineeswidget.ui

@@ -47,7 +47,7 @@
         <item row="0" column="0">
          <layout class="QHBoxLayout" name="horizontalLayout_1">
           <item>
-           <widget class="QToolButton" name="btnConnectionToDB">
+           <widget class="QToolButton" name="btnConnectionToServer">
             <property name="minimumSize">
              <size>
               <width>130</width>
@@ -55,7 +55,7 @@
              </size>
             </property>
             <property name="text">
-             <string>Connection to DB</string>
+             <string>Connection to Server</string>
             </property>
             <property name="icon">
              <iconset resource="resources.qrc">
@@ -68,7 +68,7 @@
              </size>
             </property>
             <property name="checkable">
-             <bool>true</bool>
+             <bool>false</bool>
             </property>
             <property name="toolButtonStyle">
              <enum>Qt::ToolButtonTextUnderIcon</enum>
@@ -212,19 +212,6 @@
             </property>
            </widget>
           </item>
-          <item>
-           <widget class="QToolButton" name="btnQueryGetAllLists">
-            <property name="minimumSize">
-             <size>
-              <width>58</width>
-              <height>58</height>
-             </size>
-            </property>
-            <property name="text">
-             <string>GET_ALL_LISTS</string>
-            </property>
-           </widget>
-          </item>
          </layout>
         </item>
        </layout>