diff --git a/src/external/MuSRFitGUI/devel/MuSRFit.ui b/src/external/MuSRFitGUI/devel/MuSRFit.ui
index de94b696..0cfde366 100755
--- a/src/external/MuSRFitGUI/devel/MuSRFit.ui
+++ b/src/external/MuSRFitGUI/devel/MuSRFit.ui
@@ -3962,7 +3962,7 @@
                                     <cstring>TheoryBlock</cstring>
                                 </property>
                                 <property name="enabled">
-                                    <bool>false</bool>
+                                    <bool>true</bool>
                                 </property>
                             </widget>
                             <widget class="QLabel" row="0" column="1">
@@ -4228,7 +4228,7 @@
                                     <cstring>ParametersList</cstring>
                                 </property>
                                 <property name="enabled">
-                                    <bool>false</bool>
+                                    <bool>true</bool>
                                 </property>
                             </widget>
                         </grid>
@@ -5458,6 +5458,7 @@
     <slot>RunSelectionToggle()</slot>
     <slot>fileBrowse()</slot>
     <slot>AppendToFunctions()</slot>
+    <slot>ResetFunctions()</slot>
 </slots>
 <layoutdefaults spacing="6" margin="11"/>
 </UI>
diff --git a/src/external/MuSRFitGUI/devel/MuSRFit.ui.h b/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
index dd6ed10b..8da1bcfa 100755
--- a/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
+++ b/src/external/MuSRFitGUI/devel/MuSRFit.ui.h
@@ -570,7 +570,6 @@ void MuSRFitform::ActivateShComp()
     my $Full_T_Block= $All{"Full_T_Block"};
     
     my $Component=1;
-    CParamsCombo->clear();
     
     foreach my $FitType (@FitTypes) {
 	my $Parameters=$Paramcomp[$Component-1];
@@ -613,11 +612,6 @@ void MuSRFitform::ActivateShComp()
 	}
 	$Component++;
     }  
-# Set theory block in Constraints    
-    TheoryBlock->setText($Full_T_Block);
-# Then clear the text
-    ConstraintLine->setText("");
-    FunctionsBlock->setText("");
 }
 
 void MuSRFitform::InitializeTab()
@@ -634,10 +628,6 @@ void MuSRFitform::InitializeTab()
 	}
     }
     
-# Initialize Parameters List in function block (constraints).    
-    my $ParametersList="";
-    ParametersList->setText("");
-
     my %PTable=MSR::PrepParamTable(\%All);
     
 # Setup the table with the right size    
@@ -646,9 +636,6 @@ void MuSRFitform::InitializeTab()
 	InitParamTable->setNumRows($NParam);
     }
     
-# Counter for function block (with out Alpha etc.)
-    my $ParCount=0;
-    
 # Fill the table with labels and values of parametr 
     for (my $PCount=0;$PCount<$NParam;$PCount++) {
 	my ($Param,$value,$error,$minvalue,$maxvalue,$RUN) = split(/,/,$PTable{$PCount});
@@ -661,15 +648,6 @@ void MuSRFitform::InitializeTab()
 	InitParamTable->setText($PCount,1,$error);
 	InitParamTable->setText($PCount,2,$minvalue);
 	InitParamTable->setText($PCount,3,$maxvalue);
-	
-# Also update Parameters List for the Functions block
-	(my $Ptmp,my $tmp)=split(/_/,$Param);
-	if ($Ptmp ne "" && $Ptmp ne "Alpha" &&  $Ptmp ne "N0" && $Ptmp ne "NBg") {
-	    $ParCount++;
-	    $ParametersList=$ParametersList."$Param is par$ParCount\n";
-	    ParametersList->setText($ParametersList);
-	}
-
     }
 }
 
@@ -846,3 +824,27 @@ void MuSRFitform::AppendToFunctions()
     TheoryBlock->setText($Full_T_Block);
 }
 
+void MuSRFitform::ResetFunctions()
+{
+    # Initialize Parameters List in function block (constraints).    
+    my $ParametersList="";
+    ParametersList->setText("");
+
+# Counter for function block (with out Alpha etc.)
+    my $ParCount=0;
+     CParamsCombo->clear();
+   
+# Also update Parameters List for the Functions block
+    (my $Ptmp,my $tmp)=split(/_/,$Param);
+    if ($Ptmp ne "" && $Ptmp ne "Alpha" &&  $Ptmp ne "N0" && $Ptmp ne "NBg") {
+	$ParCount++;
+	$ParametersList=$ParametersList."$Param is par$ParCount\n";
+	ParametersList->setText($ParametersList);
+    }
+# Set theory block in Constraints    
+    TheoryBlock->setText($Full_T_Block);
+# Then clear the text
+    ConstraintLine->setText("");
+    FunctionsBlock->setText("");
+
+}